diff --git a/lib/shimmie.js b/lib/shimmie.js
index 7bc91bff..4a3775a6 100644
--- a/lib/shimmie.js
+++ b/lib/shimmie.js
@@ -40,7 +40,7 @@ $(document).ready(function() {
 	try {
 		var sidebar_hidden = ($.cookie("ui-sidebar-hidden") || $.cookie("sidebar-hidden") || "").split("|");
 		for(var i in sidebar_hidden) {
-			if(sidebar_hidden[i].length > 0) {
+			if(sidebar_hidden.hasOwnProperty(i) && sidebar_hidden[i].length > 0) {
 				$(sidebar_hidden[i]+" .blockbody").hide();
 			}
 		};