diff --git a/doc/_static/js/ceph.js b/doc/_static/js/ceph.js
index e8114f0165d..5374029a0a3 100644
--- a/doc/_static/js/ceph.js
+++ b/doc/_static/js/ceph.js
@@ -33,8 +33,10 @@ $(function() {
     if (show_edit(branch, data)) {
       // patch the edit-on-github URL for correct branch
       var url = $("#edit-on-github").attr("href");
-      url = url.replace("master", branch);
-      $("#edit-on-github").attr("href", url);
+      if (url)  {
+        url = url.replace("master", branch);
+        $("#edit-on-github").attr("href", url);
+      }
       $("#docubetter").show();
     }
   });