Index: trunk/kernel/include/item.php
===================================================================
diff -u -N -r534 -r709
--- trunk/kernel/include/item.php	(.../item.php)	(revision 534)
+++ trunk/kernel/include/item.php	(.../item.php)	(revision 709)
@@ -797,8 +797,8 @@
 
 	function RemoveFromCategory($CatId,$SourceTable="",$Force=0)
 	{
+        if(!is_numeric($CatId)) return; 
 		global $objSession, $objCatList;
-
 		if(strlen($SourceTable)==0)
 			$SourceTable = GetTablePrefix()."CategoryItems";