diff --git a/static/panels.js b/static/panels.js
index 44668211..aa17595b 100644
--- a/static/panels.js
+++ b/static/panels.js
@@ -1219,7 +1219,6 @@ async function hardRefreshWebUIClient(){
 function _kanbanLooksLikeStaleClientError(err){
   const msg = String((err && err.message) || err || '').toLowerCase();
   return !!(err && err.status === 404 && (
-    msg === 'not found' ||
     msg.includes('unknown kanban endpoint') ||
     msg.includes('stale cached bundle')
   ));
diff --git a/tests/test_issue1823_kanban_not_found.py b/tests/test_issue1823_kanban_not_found.py
index 211953a8..5e716ae1 100644
--- a/tests/test_issue1823_kanban_not_found.py
+++ b/tests/test_issue1823_kanban_not_found.py
@@ -60,8 +60,8 @@ def test_unknown_kanban_endpoint_routes_are_wrapped_for_all_methods():
 def test_kanban_stale_client_error_renders_hard_refresh_escape_hatch():
     assert "function _kanbanLooksLikeStaleClientError(err)" in PANELS
     assert "err.status === 404" in PANELS
-    assert "msg === 'not found'" in PANELS
     assert "msg.includes('unknown kanban endpoint')" in PANELS
+    assert "msg.includes('stale cached bundle')" in PANELS
     assert "Kanban needs a hard refresh" in PANELS
     assert "Hard refresh now" in PANELS
     assert "navigator.serviceWorker.getRegistrations()" in PANELS