--- fieldtool_execute.module.20100818	2010-08-18 12:19:01.000000000 +1000
+++ fieldtool_execute.module	2010-08-18 12:25:17.000000000 +1000
@@ -227,7 +227,7 @@ function fieldtool_execute_node_form($op
   // If a node type has been specified, validate its existence.
   if (isset($types[$node->type])) {
     // Initialize settings:
-    if ($node->uid) {
+    if (isset($node->uid)) {
       $user = user_load($node->uid);
     }
     else {