diff --git a/frontend/src/app.js b/frontend/src/app.js
index 1b08e1663..92b68559e 100644
--- a/frontend/src/app.js
+++ b/frontend/src/app.js
@@ -114,7 +114,7 @@ Vue.use(Components);
 Vue.use(Dialogs);
 
 window.backwardsNavigationDetected = false;
-window.addEventListener("popstate", (event) => {
+window.addEventListener("popstate", () => {
   window.backwardsNavigationDetected = true;
   // give components time to react to backwardsNavigationDetected in `created` or '$route'-watcher
   setTimeout(() => {