diff --git a/src/client/vogue-client.js b/src/client/vogue-client.js
index 28a480a..be3e8e3 100644
--- a/src/client/vogue-client.js
+++ b/src/client/vogue-client.js
@@ -230,7 +230,7 @@
       scripts = document.getElementsByTagName("script");
       for (var i=0; i < scripts.length; i++) {
         src = scripts[i].getAttribute("src");
-        if (src.slice(-15) === 'vogue-client.js') break;
+        if (src && src.slice(-15) === 'vogue-client.js') break;
       }
       rootUrl = src.match(/^https?\:\/\/(.*?)\//)[0];
       // There is an optional base argument, that can be used.