diff --git a/javascript/MemberTableField.js b/javascript/MemberTableField.js
index c857c7d0..f376a882 100755
--- a/javascript/MemberTableField.js
+++ b/javascript/MemberTableField.js
@@ -6,7 +6,7 @@
  */
  
 // no confirm message for removal from a group
-if(ComplexTableField && ComplexTableField != undefined) {
+if(typeof(ComplexTableField) != 'undefined') {
 	ComplexTableField.prototype.deleteConfirmMessage = null;
 }