diff --git a/js/examples/location/index.js b/js/examples/location/index.js
index 6427ca6..6117642 100644
--- a/js/examples/location/index.js
+++ b/js/examples/location/index.js
@@ -63,7 +63,9 @@ ground dataspace G {
       assert toBroker(wsurl, currentLocation) when (currentLocation);
 
       on message Syndicate.UI.globalEvent('#my_email', 'change', _) {
-        localStorage.my_email = currentLocation[1] = email_element.value.trim();
+        var v = email_element.value.trim();
+        if (currentLocation) currentLocation[1] = v;
+        localStorage.my_email = v;
       }
 
       on message Syndicate.UI.globalEvent('#group', 'change', _) {