diff --git a/misc/ajax.js b/misc/ajax.js
index bb4a6e1..3bd2ce1 100644
--- a/misc/ajax.js
+++ b/misc/ajax.js
@@ -476,7 +476,6 @@ Drupal.ajax.prototype.getEffect = function (response) {
  * Handler for the form redirection error.
  */
 Drupal.ajax.prototype.error = function (xmlhttprequest, uri, customMessage) {
-  alert(Drupal.ajaxError(xmlhttprequest, uri, customMessage));
   // Remove the progress element.
   if (this.progress.element) {
     $(this.progress.element).remove();
@@ -493,6 +492,13 @@ Drupal.ajax.prototype.error = function (xmlhttprequest, uri, customMessage) {
     var settings = this.settings || Drupal.settings;
     Drupal.attachBehaviors(this.form, settings);
   }
+
+  // Muted xhr.abort and unexpected abort trigged by page redirection.
+  if(xmlhttp.status === 0 || xmlhttp.readyState === 0) {
+    return
+  }
+
+  alert(Drupal.ajaxError(xmlhttprequest, uri, customMessage));
 };
 
 /**
diff --git a/misc/autocomplete.js b/misc/autocomplete.js
index d71441b..cb13644 100644
--- a/misc/autocomplete.js
+++ b/misc/autocomplete.js
@@ -310,6 +310,11 @@ Drupal.ACDB.prototype.search = function (searchString) {
         }
       },
       error: function (xmlhttp) {
+        // Muted xhr.abort and unexpected abort trigged by page redirection.
+        if(xmlhttp.status === 0 || xmlhttp.readyState === 0) {
+          return
+        }
+
         alert(Drupal.ajaxError(xmlhttp, db.uri));
       }
     });