--- a/dom/datastore/DataStoreCursorImpl.jsm
+++ b/dom/datastore/DataStoreCursorImpl.jsm
@@ -68,17 +68,17 @@ Cu.import('resource://gre/modules/XPCOMU
  *   YES L[0] == 'void': R=L[0]; state->init; loop
  *   NO: state->revisionCheck; loop
  *
  * State: done: send a 'done' with R
  */
 
 /* Helper functions */
 function createDOMError(aWindow, aEvent) {
-  return new aWindow.DOMError(aEvent.target.error.name);
+  return new aWindow.DOMError(aEvent);
 }
 
 /* DataStoreCursor object */
 this.DataStoreCursor = function(aWindow, aDataStore, aRevisionId) {
   debug("DataStoreCursor created");
   this.init(aWindow, aDataStore, aRevisionId);
 }