From aad6492a6a25a069b26829b603fcd1b03698cbb8 Mon Sep 17 00:00:00 2001
From: Philip Allgaier <mail@spacegaier.de>
Date: Sat, 21 Nov 2020 13:50:56 +0100
Subject: [PATCH] Show error if no entity specified for history card (#7752)

---
 src/panels/lovelace/cards/hui-history-graph-card.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/panels/lovelace/cards/hui-history-graph-card.ts b/src/panels/lovelace/cards/hui-history-graph-card.ts
index 8b67582946..76c71684de 100644
--- a/src/panels/lovelace/cards/hui-history-graph-card.ts
+++ b/src/panels/lovelace/cards/hui-history-graph-card.ts
@@ -73,8 +73,8 @@ export class HuiHistoryGraphCard extends LitElement implements LovelaceCard {
   }
 
   public setConfig(config: HistoryGraphCardConfig): void {
-    if (!config.entities) {
-      throw new Error("Entities must be defined");
+    if (!config.entities.length) {
+      throw new Error("Entities must be specified");
     }
 
     if (config.entities && !Array.isArray(config.entities)) {