From 324658a36bc75d40123fd624c7f19fbba0fe2fd6 Mon Sep 17 00:00:00 2001
From: Bram Kragten <mail@bramkragten.nl>
Date: Mon, 30 Aug 2021 22:06:58 +0200
Subject: [PATCH] Fix energy graph when sum is 0 (#9914)

---
 src/panels/lovelace/cards/energy/hui-energy-usage-graph-card.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/panels/lovelace/cards/energy/hui-energy-usage-graph-card.ts b/src/panels/lovelace/cards/energy/hui-energy-usage-graph-card.ts
index 354e14c993..bc807a2e04 100644
--- a/src/panels/lovelace/cards/energy/hui-energy-usage-graph-card.ts
+++ b/src/panels/lovelace/cards/energy/hui-energy-usage-graph-card.ts
@@ -386,7 +386,7 @@ export class HuiEnergyUsageGraphCard
           if (stat.sum === null) {
             return;
           }
-          if (!prevValue) {
+          if (prevValue === undefined) {
             prevValue = stat.sum;
             return;
           }