diff --git a/common/js/xml_handler.js b/common/js/xml_handler.js
index 24207788a..7495dbd93 100644
--- a/common/js/xml_handler.js
+++ b/common/js/xml_handler.js
@@ -241,11 +241,12 @@
 			
 			// If the response contains an error, display the error message.
 			if(data.error != "0" && data.error > -1000) {
+				// Should not display the error message when the callback function returns false.
+				if ($.isFunction(callback_error) && callback_error(data) === false) {
+					return;
+				}
 				if(data.error == -1 && data.message == "admin.msg_is_not_administrator") {
 					alert("You are not logged in as an administrator.");
-					if ($.isFunction(callback_error)) {
-						callback_error(data);
-					}
 					return;
 				} else {
 					if (data.message) {
@@ -253,9 +254,6 @@
 					} else {
 						alert("AJAX communication error while requesting " + request_info);
 					}
-					if ($.isFunction(callback_error)) {
-						callback_error(data);
-					}
 					return;
 				}
 			}