diff --git a/Tests/dblayerooComplet.php b/Tests/dblayerooComplet.php
index 38639bd..716fd44 100644
--- a/Tests/dblayerooComplet.php
+++ b/Tests/dblayerooComplet.php
@@ -532,7 +532,7 @@ class test_dblayeroo_{ENGINE} extends PHPUnit_Framework_TestCase
         'groupedoo.object' => 'object',
         'groupedoo.where' => 'where',
         'groupedoo.with space' => NULL,
-        'usersoo.uid' => 0,
+        'usersoo.uid' => NULL,
         'usersoo.gecos' => NULL,
         'usersoo.password' => NULL,
         'usersoo.group' => NULL,
diff --git a/dblayeroo.php b/dblayeroo.php
index 5129133..84beb69 100644
--- a/dblayeroo.php
+++ b/dblayeroo.php
@@ -2882,8 +2882,8 @@ class dblayeroo
             if ($pos)
               $name = substr ($columns[$colNb], 0, $pos);
             $name = str_replace ("DISTINCT ", "", $name);
-            if (strtolower ($fieldsAll[$name][0]) ===
-                "integer")
+            if (strtolower ($fieldsAll[$name][0]) === "integer" &&
+                $val !== null)
               $val = intval ($val);
           }
           if (($pos = strpos ($columns[$colNb], " AS ".$this->sep)) !== false)