diff --git a/Tests/RobotstxtTest.php b/Tests/RobotstxtTest.php
index 8b494a5..fe5341d 100644
--- a/Tests/RobotstxtTest.php
+++ b/Tests/RobotstxtTest.php
@@ -15,25 +15,25 @@ use Domframework\Robotstxt;
 class RobotstxtTest extends \PHPUnit_Framework_TestCase
 {
   // Empty Robots
-    public function test_Construct_1()
+    public function testConstruct1()
     {
         $robotstxt = new Robotstxt("", "domsearch");
         $res = $robotstxt->allow();
         $this->assertSame($res, ["/"]);
     }
-    public function test_Construct_2()
+    public function testConstruct2()
     {
         $robotstxt = new Robotstxt("", "domsearch");
         $res = $robotstxt->disallow();
         $this->assertSame($res, array ());
     }
-    public function test_Construct_3()
+    public function testConstruct3()
     {
         $robotstxt = new Robotstxt("", "domsearch");
         $res = $robotstxt->sitemaps();
         $this->assertSame($res, array ());
     }
-    public function test_Construct_4()
+    public function testConstruct4()
     {
         $robotstxt = new Robotstxt("", "domsearch");
         $res = $robotstxt->crawldelay();
@@ -41,7 +41,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
     }
 
   // Allow
-    public function test_allow_1()
+    public function testAllow1()
     {
         $robotstxt = new Robotstxt(
             "User-Agent: *\nDisallow:\n",
@@ -50,7 +50,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
         $res = $robotstxt->allow();
         $this->assertSame($res, ["/"]);
     }
-    public function test_allow_2()
+    public function testAllow2()
     {
         $robotstxt = new Robotstxt(
             "User-Agent: *\nDisallow:\n\nUser-Agent: DomSearch\nDisallow:\n",
@@ -59,7 +59,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
         $res = $robotstxt->allow();
         $this->assertSame($res, ["/"]);
     }
-    public function test_allow_3()
+    public function testAllow3()
     {
         $robotstxt = new Robotstxt(
             "User-Agent: DomSearch\nDisallow:\n\nUser-Agent: *\nDisallow:\n",
@@ -68,7 +68,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
         $res = $robotstxt->allow();
         $this->assertSame($res, ["/"]);
     }
-    public function test_allow_4()
+    public function testAllow4()
     {
         $robotstxt = new Robotstxt(
             "User-Agent: DomSearch\n" .
@@ -84,7 +84,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
     }
 
   // Disallow
-    public function test_disallow_1()
+    public function testDisallow1()
     {
         $robotstxt = new Robotstxt(
             "User-Agent: *\nDisallow: /\n",
@@ -93,7 +93,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
         $res = $robotstxt->disallow();
         $this->assertSame($res, ["/"]);
     }
-    public function test_disallow_2()
+    public function testDisallow2()
     {
         $robotstxt = new Robotstxt(
             "User-Agent: *\nDisallow: /\n\nUser-Agent: DomSearch\nDisallow: /\n",
@@ -102,7 +102,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
         $res = $robotstxt->disallow();
         $this->assertSame($res, ["/"]);
     }
-    public function test_disallow_3()
+    public function testDisallow3()
     {
         $robotstxt = new Robotstxt(
             "User-Agent: DomSearch\nDisallow: /\n\nUser-Agent: *\nDisallow: /\n",
@@ -113,7 +113,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
     }
 
   // Sitemaps
-    public function test_sitemaps_1()
+    public function testSitemaps1()
     {
         $robotstxt = new Robotstxt(
             "User-Agent: DomSearch\nDisallow: /\n\nUser-Agent: *\nDisallow: /\n",
@@ -122,7 +122,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
         $res = $robotstxt->sitemaps();
         $this->assertSame($res, []);
     }
-    public function test_sitemaps_2()
+    public function testSitemaps2()
     {
         $robotstxt = new Robotstxt(
             "User-Agent: *\nDisallow: /\nSitemap: http://example.com/sitemap.xml",
@@ -131,7 +131,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
         $res = $robotstxt->sitemaps();
         $this->assertSame($res, ["http://example.com/sitemap.xml"]);
     }
-    public function test_sitemaps_3()
+    public function testSitemaps3()
     {
         $robotstxt = new Robotstxt(
             "User-Agent: *\nDisallow: /\n" .
@@ -146,7 +146,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
         );
     }
 
-    public function test_sitemaps_error_1()
+    public function testSitemapsError1()
     {
         $robotstxt = new Robotstxt(
             "User-Agent: *\nDisallow: /\nSitemap: URL",
@@ -157,7 +157,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
     }
 
   // Host
-    public function test_host_1()
+    public function testHost1()
     {
         $robotstxt = new Robotstxt(
             "User-Agent: *\nDisallow: /\n",
@@ -166,7 +166,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
         $res = $robotstxt->host();
         $this->assertSame($res, null);
     }
-    public function test_host_2()
+    public function testHost2()
     {
         $robotstxt = new Robotstxt(
             "User-Agent: *\nDisallow: /\n\nHost: localhost",
@@ -175,7 +175,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
         $res = $robotstxt->host();
         $this->assertSame($res, "localhost");
     }
-    public function test_host_error_1()
+    public function testHostError1()
     {
         $robotstxt = new Robotstxt(
             "User-Agent: *\nDisallow: /\n\nHost: localhost\nHoST: toto",
@@ -184,7 +184,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
         $res = $robotstxt->host();
         $this->assertSame($res, "localhost");
     }
-    public function test_host_error_2()
+    public function testHostError2()
     {
         $robotstxt = new Robotstxt(
             "User-Agent: *\nDisallow: /\n\nHost: localhost\nHoST: toto",
@@ -195,13 +195,13 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
     }
 
   // URLAllow
-    public function test_urlallow_1()
+    public function testUrlallow1()
     {
         $robotstxt = new Robotstxt("", "domsearch");
         $res = $robotstxt->URLAllow("/");
         $this->assertSame($res, true);
     }
-    public function test_urlallow_2()
+    public function testUrlallow2()
     {
         $robotstxt = new Robotstxt(
             "User-Agent: *\nDisallow: /",
@@ -210,7 +210,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
         $res = $robotstxt->URLAllow("/");
         $this->assertSame($res, false);
     }
-    public function test_urlallow_3()
+    public function testUrlallow3()
     {
         $robotstxt = new Robotstxt(
             "User-Agent: *\nDisallow: /\nAllow: /allow/",
@@ -219,7 +219,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
         $res = $robotstxt->URLAllow("/");
         $this->assertSame($res, false);
     }
-    public function test_urlallow_4()
+    public function testUrlallow4()
     {
         $robotstxt = new Robotstxt(
             "User-Agent: *\nDisallow: /\nAllow: /allow/",
@@ -228,7 +228,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
         $res = $robotstxt->URLAllow("/allow/file");
         $this->assertSame($res, true);
     }
-    public function test_urlallow_5()
+    public function testUrlallow5()
     {
         $robotstxt = new Robotstxt(
             "User-Agent: *\nDisallow: /\nAllow: /allow/*.gif$",
@@ -237,7 +237,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
         $res = $robotstxt->URLAllow("/allow/file.gif");
         $this->assertSame($res, true);
     }
-    public function test_urlallow_6()
+    public function testUrlallow6()
     {
         $robotstxt = new Robotstxt(
             "User-Agent: *\nDisallow: /\nAllow: /allow/*.gif$",
@@ -246,7 +246,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
         $res = $robotstxt->URLAllow("/allow/.gif");
         $this->assertSame($res, false);
     }
-    public function test_urlallow_7()
+    public function testUrlallow7()
     {
         $robotstxt = new Robotstxt(
             "User-Agent: *\nDisallow: /\nAllow: /allow/*.gif\$",
@@ -257,7 +257,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
     }
 
   // Tests like http://www.robotstxt.org/norobots-rfc.txt
-    public function test_rfc_unhipbot_1()
+    public function testRfcUnhipbot1()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -285,7 +285,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             false
         );
     }
-    public function test_rfc_unhipbot_2()
+    public function testRfcUnhipbot2()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -313,7 +313,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             false
         );
     }
-    public function test_rfc_unhipbot_3()
+    public function testRfcUnhipbot3()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -341,7 +341,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_unhipbot_4()
+    public function testRfcUnhipbot4()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -369,7 +369,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             false
         );
     }
-    public function test_rfc_unhipbot_5()
+    public function testRfcUnhipbot5()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -397,7 +397,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             false
         );
     }
-    public function test_rfc_unhipbot_6()
+    public function testRfcUnhipbot6()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -425,7 +425,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             false
         );
     }
-    public function test_rfc_unhipbot_7()
+    public function testRfcUnhipbot7()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -453,7 +453,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             false
         );
     }
-    public function test_rfc_unhipbot_8()
+    public function testRfcUnhipbot8()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -481,7 +481,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             false
         );
     }
-    public function test_rfc_unhipbot_9()
+    public function testRfcUnhipbot9()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -509,7 +509,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             false
         );
     }
-    public function test_rfc_unhipbot_10()
+    public function testRfcUnhipbot10()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -537,7 +537,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             false
         );
     }
-    public function test_rfc_unhipbot_11()
+    public function testRfcUnhipbot11()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -565,7 +565,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             false
         );
     }
-    public function test_rfc_webcrawler_1()
+    public function testRfcWebcrawler1()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -593,7 +593,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_webcrawler_2()
+    public function testRfcWebcrawler2()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -621,7 +621,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_webcrawler_3()
+    public function testRfcWebcrawler3()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -649,7 +649,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_webcrawler_4()
+    public function testRfcWebcrawler4()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -677,7 +677,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_webcrawler_5()
+    public function testRfcWebcrawler5()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -705,7 +705,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_webcrawler_6()
+    public function testRfcWebcrawler6()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -733,7 +733,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_webcrawler_7()
+    public function testRfcWebcrawler7()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -761,7 +761,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_webcrawler_8()
+    public function testRfcWebcrawler8()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -789,7 +789,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_webcrawler_9()
+    public function testRfcWebcrawler9()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -817,7 +817,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_webcrawler_10()
+    public function testRfcWebcrawler10()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -845,7 +845,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_webcrawler_11()
+    public function testRfcWebcrawler11()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -873,7 +873,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_excite_1()
+    public function testRfcExcite1()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -901,7 +901,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_excite_2()
+    public function testRfcExcite2()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -929,7 +929,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_excite_3()
+    public function testRfcExcite3()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -957,7 +957,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_excite_4()
+    public function testRfcExcite4()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -985,7 +985,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_excite_5()
+    public function testRfcExcite5()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -1013,7 +1013,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_excite_6()
+    public function testRfcExcite6()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -1041,7 +1041,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_excite_7()
+    public function testRfcExcite7()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -1069,7 +1069,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_excite_8()
+    public function testRfcExcite8()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -1097,7 +1097,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_excite_9()
+    public function testRfcExcite9()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -1125,7 +1125,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_excite_10()
+    public function testRfcExcite10()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -1153,7 +1153,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_excite_11()
+    public function testRfcExcite11()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -1181,7 +1181,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_other_1()
+    public function testRfcOther1()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -1206,7 +1206,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
       // }}}
         $this->assertSame($robotstxt->URLAllow("http://www.fict.org/"), false);
     }
-    public function test_rfc_other_2()
+    public function testRfcOther2()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -1234,7 +1234,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             false
         );
     }
-    public function test_rfc_other_3()
+    public function testRfcOther3()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -1262,7 +1262,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_other_4()
+    public function testRfcOther4()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -1290,7 +1290,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_other_5()
+    public function testRfcOther5()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -1318,7 +1318,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_other_6()
+    public function testRfcOther6()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -1346,7 +1346,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_other_7()
+    public function testRfcOther7()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -1374,7 +1374,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             false
         );
     }
-    public function test_rfc_other_8()
+    public function testRfcOther8()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -1402,7 +1402,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
-    public function test_rfc_other_9()
+    public function testRfcOther9()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -1430,7 +1430,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             false
         );
     }
-    public function test_rfc_other_10()
+    public function testRfcOther10()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -1458,7 +1458,7 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             false
         );
     }
-    public function test_rfc_other_11()
+    public function testRfcOther11()
     {
       // {{{
         $robotstxt = new Robotstxt(
@@ -1486,4 +1486,49 @@ class RobotstxtTest extends \PHPUnit_Framework_TestCase
             true
         );
     }
+
+    // Allow/Disallow must start by slash or be empty
+    public function testAllowDisallowSlash1()
+    {
+        $robotstxt = new Robotstxt(
+            "User-Agent: *\n" .
+            "Disallow: INVALID\n\n",
+            "domsearch"
+        );
+        $res = $robotstxt->errors();
+        $this->assertSame($res, [1 => "Disallow : Line must start by slash"]);
+    }
+
+    public function testAllowDisallowSlash2()
+    {
+        $robotstxt = new Robotstxt(
+            "User-Agent: *\n" .
+            "Disallow: \n\n",
+            "domsearch"
+        );
+        $res = $robotstxt->errors();
+        $this->assertSame($res, []);
+    }
+
+    public function testAllowDisallowSlash3()
+    {
+        $robotstxt = new Robotstxt(
+            "User-Agent: *\n" .
+            "Allow: INVALID\n\n",
+            "domsearch"
+        );
+        $res = $robotstxt->errors();
+        $this->assertSame($res, [1 => "Allow : Line must start by slash"]);
+    }
+
+    public function testAllowDisallowSlash4()
+    {
+        $robotstxt = new Robotstxt(
+            "User-Agent: *\n" .
+            "Allow: \n\n",
+            "domsearch"
+        );
+        $res = $robotstxt->errors();
+        $this->assertSame($res, []);
+    }
 }
diff --git a/src/Robotstxt.php b/src/Robotstxt.php
index c2606a9..2b4b1cd 100644
--- a/src/Robotstxt.php
+++ b/src/Robotstxt.php
@@ -13,6 +13,7 @@ namespace Domframework;
   * It allow to examine an URL against the robots.txt file and return if the URL
   * is allowed to be used or not
   * The definition of the format of robots.txt file is available here :
+  *   https://www.rfc-editor.org/rfc/rfc9309.txt
   *   http://www.robotstxt.org/norobots-rfc.txt
   *   https://en.wikipedia.org/wiki/Robots_exclusion_standard
   */
@@ -94,15 +95,15 @@ class Robotstxt
         // Get the Allow and Disallow lines. The stop will arrive on first
         // User-Agent line arriving after a Allow/Disallow.
         // Comments and empty lines are removed
-        for ($i = key($keys); $i < count($content); $i++) {
-            $line = trim($content[$i]);
+        for ($nb = key($keys); $nb < count($content); $nb++) {
+            $line = trim($content[$nb]);
             if (stripos($line, "Sitemap:") === 0) {
                 // Already managed in the general parser. Not needed in the specific
         // user-agent parser. Must at least be catched to not generate an
         // error
             } elseif (stripos($line, "Host:") === 0) {
                 if ($this->host !== null) {
-                    $this->errors[$i] = dgettext(
+                    $this->errors[$nb] = dgettext(
                         "domframework",
                         "Multiple Hosts set"
                     );
@@ -112,15 +113,31 @@ class Robotstxt
             } elseif ($line === "" || $line[0] === "#") {
                 // Comment, empty line : SKIP
             } elseif (stripos($line, "allow:") === 0) {
-                $this->allow[] = $this->getValueFromLine($line);
+                $allow = $this->getValueFromLine($line);
+                if (trim($allow) === "" || $allow[0] === "/") {
+                  $this->allow[] = $allow;
+                } else {
+                    $this->errors[$nb] = dgettext(
+                        "domframework",
+                        "Allow : Line must start by slash"
+                    );
+                }
             } elseif (stripos($line, "disallow:") === 0) {
-                $this->disallow[] = $this->getValueFromLine($line);
+                $disallow = $this->getValueFromLine($line);
+                if (trim($disallow) === "" || $disallow[0] === "/") {
+                    $this->disallow[] = $disallow;
+                } else {
+                    $this->errors[$nb] = dgettext(
+                        "domframework",
+                        "Disallow : Line must start by slash"
+                    );
+                }
             } elseif (stripos($line, "crawl-delay:") === 0) {
                 $val = $this->getValueFromLine($line);
                 if ($val > 1 && $val < 60 && $this->crawldelay === null) {
                     $this->crawldelay = intval($val);
                 } else {
-                    $this->errors[$i] = dgettext(
+                    $this->errors[$nb] = dgettext(
                         "domframework",
                         "Crawldelay : value out of range (1-60)"
                     );
@@ -134,7 +151,7 @@ class Robotstxt
                 }
             } else {
                 // Not managed line : error
-                $this->errors[$i] = sprintf(dgettext(
+                $this->errors[$nb] = sprintf(dgettext(
                     "domframework",
                     "Invalid line : unknown command : '%s'"
                 ), $line);