From 81053f2e078c7f1b04945bdf63c9cf1a806add62 Mon Sep 17 00:00:00 2001
From: karwosts <32912880+karwosts@users.noreply.github.com>
Date: Wed, 25 Oct 2023 06:48:05 -0700
Subject: [PATCH] Fix an undefined exception in more-info popup for history
 graph (#18404)

---
 src/components/chart/state-history-charts.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/components/chart/state-history-charts.ts b/src/components/chart/state-history-charts.ts
index 24854e8719..61d02699ea 100644
--- a/src/components/chart/state-history-charts.ts
+++ b/src/components/chart/state-history-charts.ts
@@ -223,7 +223,7 @@ export class StateHistoryCharts extends LitElement {
         );
       } else {
         this._computedStartTime = new Date(
-          this.historyData.timeline.reduce(
+          (this.historyData?.timeline ?? []).reduce(
             (minTime, stateInfo) =>
               Math.min(
                 minTime,