diff --git a/frontend/src/ketr-photos/ketr-photos.html b/frontend/src/ketr-photos/ketr-photos.html
index 22b6730..54333a5 100755
--- a/frontend/src/ketr-photos/ketr-photos.html
+++ b/frontend/src/ketr-photos/ketr-photos.html
@@ -428,7 +428,7 @@
 
         onScroll: function(event) {
           if (this.disableScrolling) {
-            event.preventDefault();
+            if (event) event.preventDefault();
             window.scrollTo(this.topStickX, this.topStickY);
             return;
           }