diff --git a/jquery/jquery.js b/jquery/jquery.js
index 1e1e4aba..4a9614c5 100644
--- a/jquery/jquery.js
+++ b/jquery/jquery.js
@@ -577,7 +577,7 @@ $.Select = function( t, context ) {
 };
 
 $.tag = function(a,b){
-	return a && a.getElementsByTagName ?
+	return a && typeof a.getElementsByTagName != 'undefined' ?
 		a.getElementsByTagName( b ) : [];
 };