diff --git a/public/assets/g/crazycattle3d/index.html b/public/assets/g/crazycattle3d/index.html
index 249b37a6..b811dcf7 100644
--- a/public/assets/g/crazycattle3d/index.html
+++ b/public/assets/g/crazycattle3d/index.html
@@ -89,7 +89,9 @@ html, body, #canvas {
 <link rel="apple-touch-icon" href="index.apple-touch-icon.png"/>
 
 <script>
-window.open(location.origin + '/assets/g/crazycattle3d/', '_blank');
+if (window.self !== window.top) {
+    window.open(location.origin + '/assets/g/crazycattle3d/', '_blank');
+}
 </script>
 	</head>
 	<body>
