diff --git a/web/js/messages.js b/web/js/messages.js
--- a/web/js/messages.js
+++ b/web/js/messages.js
@@ -77,7 +77,7 @@
 			_language = LNG_POR_DEFECTO;
 		}
 	}
-    var total = arrMessages.length;
+    var total = (arrMessages ? arrMessages.length : 0);
 	for (var i=0;i<total;i++) {
 		if (arrMessages[i].language == _language)
 			if (arrMessages[i].message == index)