diff --git a/modules/blocklayered/blocklayered.js b/modules/blocklayered/blocklayered.js
index 0a2301555..f3c31f290 100644
--- a/modules/blocklayered/blocklayered.js
+++ b/modules/blocklayered/blocklayered.js
@@ -328,8 +328,10 @@ function openCloseFilter()
 function stopAjaxQuery() {
 	if (typeof(ajaxQueries) == 'undefined')
 		ajaxQueries = new Array();
-	for(i = 0; i < ajaxQueries.length; i++)
-		ajaxQueries[i].abort();
+	for(i = 0; i < ajaxQueries.length; i++) {
+		if (typeof ajaxQueries[i] != 'undefined')
+			ajaxQueries[i].abort();
+	}		
 	ajaxQueries = new Array();
 }