diff --git a/routeSQL.php b/routeSQL.php
index f707bd6..e8b0d74 100644
--- a/routeSQL.php
+++ b/routeSQL.php
@@ -290,7 +290,7 @@ class routeSQL
     $route->allowSlashes=false;
 	  $route->get ("rest/".$this->url_prefix."(\.{extension})?".
                  "(\?({p1}=({v1})?)(&{p2}=({v2})?(&{p3}=({v3})?)?)?)?",
-      function ($extension, $p1, $v1, $p2, $v2, $p3, $v3, $chain)
+      function ($extension, $p1, $v1, $p2, $v2, $p3, $v3, $chain=null)
     {
       if ($this->chained !== null)
       {
@@ -369,7 +369,7 @@ class routeSQL
     });
 
     $route->post ("rest/".$this->url_prefix."(\.{extension})?",
-      function ($extension, $chain)
+      function ($extension, $chain=null)
     {
       if ($this->chained !== null)
       {
@@ -437,7 +437,7 @@ class routeSQL
     });
 
     $route->put ("rest/".$this->url_prefix."(\.{extension})?/{id}",
-      function ($extension, $id, $chain)
+      function ($extension, $id, $chain=null)
     {
       if ($this->chained !== null)
       {
@@ -503,7 +503,7 @@ class routeSQL
     });
 
     $route->delete ("rest/".$this->url_prefix."(\.{extension})?/{id}",
-      function ($extension, $id, $chain)
+      function ($extension, $id, $chain=null)
     {
       if ($this->chained !== null)
       {
@@ -573,7 +573,7 @@ class routeSQL
 	  $route = new route ();
     $route->debug = $this->debug;;
     $route->allowSlashes=false;
-	  $route->get ($this->url_prefix."/", function ($chain) use ($route)
+	  $route->get ($this->url_prefix."/", function ($chain=null) use ($route)
     {
       $route->redirect ("/".str_replace ("{chain}", $chain, $this->url_prefix),
                         "");
@@ -581,7 +581,7 @@ class routeSQL
 
 	  $route->get ($this->url_prefix.
                  "(\?({p1}=({v1})?)(&{p2}=({v2})?(&{p3}=({v3})?)?)?)?",
-      function ($p1, $v1, $p2, $v2, $p3, $v3, $chain) use ($route)
+      function ($p1, $v1, $p2, $v2, $p3, $v3, $chain=null) use ($route)
 	  {
 	    // List all the objects of the table
       if ($this->chained !== null)
@@ -851,7 +851,7 @@ class routeSQL
 	  });
 
 	  $route->get ($this->url_prefix."/{id}/delete/{token}",
-                 function ($id, $token, $chain)
+                 function ($id, $token, $chain=null)
 	  {
 	    // Delete an existing object if the token is valid
       if ($this->chained !== null)
@@ -912,7 +912,7 @@ class routeSQL
 
 	  });
 
-	  $route->get ($this->url_prefix."/add", function ($chain) 
+	  $route->get ($this->url_prefix."/add", function ($chain=null) 
 	  {
       // Add a new entry : form to be filled by the user
       if ($this->chained !== null)
@@ -1025,7 +1025,7 @@ class routeSQL
       $this->rendererhtml ($content);
 	  });
 
-	  $route->post ($this->url_prefix."/add", function ($chain) use ($route) 
+	  $route->post ($this->url_prefix."/add", function ($chain=null) use ($route) 
 	  {
       // Add a new entry : effective save of the datas
       if ($this->chained !== null)
@@ -1100,7 +1100,7 @@ class routeSQL
 
 	  });
 
-	  $route->get ($this->url_prefix."/{id}", function ($id, $chain)
+	  $route->get ($this->url_prefix."/{id}", function ($id, $chain=null)
 	  {
       // List the details of one existing object
       if ($this->chained !== null)
@@ -1221,7 +1221,8 @@ class routeSQL
       $this->rendererhtml ($content);
 	  });
 
-	  $route->post ($this->url_prefix."/{id}", function ($id, $chain) use ($route)
+	  $route->post ($this->url_prefix."/{id}", function ($id, $chain=null)
+                  use ($route)
 	  {
 	    // Save the details of one existing object
       if ($this->chained !== null)