diff --git a/implementations/group.node.inc b/implementations/group.node.inc
index 3692838..b9154aa 100644
--- a/implementations/group.node.inc
+++ b/implementations/group.node.inc
@@ -352,7 +352,7 @@ function group_node_update($node) {
  * Helper for hook_node_insert() and hook_node_update().
  */
 function group_node_save($node) {
-  if (isset($node->group)) {
+  if (!empty($node->group)) {
     group_load($node->group)->addEntity($node->nid, 'node', $node->type);
   }
 }