Index: trunk/kernel/include/searchitems.php
===================================================================
diff -u -r1155 -r1157
--- trunk/kernel/include/searchitems.php	(.../searchitems.php)	(revision 1155)
+++ trunk/kernel/include/searchitems.php	(.../searchitems.php)	(revision 1157)
@@ -754,14 +754,22 @@
     //$return .= $notallowed;
     if (strlen($notallowed) && is_object($SearchObj)) 
     {	    
-    	$or_is_null = ' OR '.substr($notallowed, 0, strpos($notallowed, 'NOT')).' IS NULL ';
+    	$elements = explode('.', $notallowed); // this and below code is to detect if $notallowed clause is concerned custom field or not
+    	if (strpos($elements[0], 'inp')) 
+    	{
+    		$or_is_null = '';
+    	}
+    	else 
+    	{
+    		$or_is_null = ' OR '.substr($notallowed, 1, strpos($notallowed, 'NOT') - 1).' IS NULL ';
+    	}
     	if (!strlen($SearchObj->ExcludeWhereClause)) 
 	    {	    	
-	    	$SearchObj->ExcludeWhereClause = '('.$notallowed.$or_is_null.'))';
+	    	$SearchObj->ExcludeWhereClause = '('.$notallowed.$or_is_null.')';
 	    }
 	    else 
 	    {
-	    	$SearchObj->ExcludeWhereClause .= ' AND ('.$notallowed.$or_is_null.'))';
+	    	$SearchObj->ExcludeWhereClause .= ' AND ('.$notallowed.$or_is_null.')';
 	    }
     }