--- content.inc	2008-08-12 15:46:54.296087217 +0200
+++ content.new.inc	2008-08-12 15:47:43.860191424 +0200
@@ -109,7 +109,7 @@
               if (intval($value) > 0) {
                 $value = intval($value);
               }
-              else {
+              else if(trim($value) != ''){
                 $referenced_nodes = array();
                 $sql = "SELECT nid, title FROM {node} WHERE title SOUNDS LIKE '%s'";
                 $result = db_query($sql, $value);