Index: sites/all/modules/contrib/cck/content.module
===================================================================
--- sites/all/modules/contrib/cck/content.module	(revision 2828)
+++ sites/all/modules/contrib/cck/content.module	(revision )
@@ -1070,8 +1070,10 @@
           foreach ($node->$field['field_name'] as $delta => $item) {
             $record = array();
             foreach ($db_info['columns'] as $column => $attributes) {
+              if (isset($item[$column])) {
-              $record[$attributes['column']] = $item[$column];
-            }
+                $record[$attributes['column']] = $item[$column];
+              }
+            }
             $record['nid'] = $node->nid;
             $record['vid'] = $node->vid;
             $record['delta'] = $delta;