diff --git a/web/src/app/js/app.js b/web/src/app/js/app.js
index 38142ba..c3615ef 100644
--- a/web/src/app/js/app.js
+++ b/web/src/app/js/app.js
@@ -625,7 +625,8 @@ window.onscroll = function(e) {
 		return;
 	if (scroll() === 0)
 		setTimeout(async function() {
-			if (scroll() === 0) {
+			if (scroll() === 0 && page() !== null &&
+				page().onScroll !== undefined) {
 				await page().onScroll(0, true);
 				window.scrollTo(0,0);
 			}