From fc88922ce3fe5fb716654405f7f9716fc8e1b350 Mon Sep 17 00:00:00 2001
From: Zack Arnett <arnett.zackary@gmail.com>
Date: Thu, 20 Feb 2020 03:57:14 -0500
Subject: [PATCH] Fix CPU and Browser Usuage (#4935)

---
 src/panels/lovelace/cards/hui-history-graph-card.ts | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/panels/lovelace/cards/hui-history-graph-card.ts b/src/panels/lovelace/cards/hui-history-graph-card.ts
index 4618751429..02a895ac99 100644
--- a/src/panels/lovelace/cards/hui-history-graph-card.ts
+++ b/src/panels/lovelace/cards/hui-history-graph-card.ts
@@ -87,9 +87,11 @@ export class HuiHistoryGraphCard extends LitElement implements LovelaceCard {
       return;
     }
 
-    const oldConfig = changedProps.get("_config") as
-      | HistoryGraphCardConfig
-      | undefined;
+    if (!changedProps.has("_config")) {
+      return;
+    }
+
+    const oldConfig = changedProps.get("_config") as HistoryGraphCardConfig;
 
     if (oldConfig !== this._config) {
       this._getStateHistory();