From 589751de2bb43c8cb5d5a3b7abacf839c017f153 Mon Sep 17 00:00:00 2001
From: Edward Betts <edward@4angle.com>
Date: Fri, 16 Jul 2021 11:59:28 +0200
Subject: [PATCH] State can be empty

---
 frontend/App.vue | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/frontend/App.vue b/frontend/App.vue
index fd153fc..2e0c49d 100644
--- a/frontend/App.vue
+++ b/frontend/App.vue
@@ -1430,6 +1430,8 @@ export default {
     },
     onpopstate(event) {
       var state = event.state;
+      if (!state) return;
+
       this.mode = state.mode;
       this.zoom = state.zoom;
       this.search_text = state.search_text;