diff --git a/content.module b/content.module
index d8c4a4d..b056ec1 100644
--- a/content.module
+++ b/content.module
@@ -1245,7 +1245,8 @@ function _content_field_invoke($op, &$node, $teaser = NULL, $page = NULL) {
     $items = isset($node->$field['field_name']) ? $node->$field['field_name'] : array();
 
     // Make sure AHAH 'add more' button isn't sent to the fields for processing.
-    unset($items[$field['field_name'] .'_add_more']);
+    if(isset($items[$field['field_name'] .'_add_more']))
+        unset($items[$field['field_name'] .'_add_more']);
 
     $module = $field_types[$field['type']]['module'];
     $function = $module .'_field';