From 4ecb44111d16048ef1ee3a7e96acb66ac9c39303 Mon Sep 17 00:00:00 2001
From: Samuel Mannehed <samuel@cendio.se>
Date: Wed, 12 Oct 2022 12:39:49 +0200
Subject: Check if activeElement exists before using it

According to MDN, document.activeElement can be null if there is no
focused element.
---
 app/error-handler.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/error-handler.js b/app/error-handler.js
index a68fe92..675bc51 100644
--- a/app/error-handler.js
+++ b/app/error-handler.js
@@ -53,7 +53,7 @@ function handleError(event, err) {
 
         // Remove focus from the currently focused element in order to
         // prevent keyboard interaction from continuing
-        document.activeElement.blur();
+        if (document.activeElement) { document.activeElement.blur(); }
 
         // Don't let any element be focusable when showing the error
         let keyboardFocusable = 'a[href], button, input, textarea, select, details, [tabindex]';
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