diff --git a/js/id/renderer/background.js b/js/id/renderer/background.js
index 3e366282c..5cdc5835b 100644
--- a/js/id/renderer/background.js
+++ b/js/id/renderer/background.js
@@ -163,7 +163,7 @@ iD.Background = function(backgroundType) {
 
     function setHash(source) {
         var tag = source.data && source.data.sourcetag;
-        if (!tag && source.data.name === 'Custom') {
+        if (!tag && source.data && source.data.name === 'Custom') {
             tag = 'custom:' + source.data.template;
         }
         var q = iD.util.stringQs(location.hash.substring(1));