From f55e911313e7866e26469926e250c84ec5239531 Mon Sep 17 00:00:00 2001
From: Philip Allgaier <mail@spacegaier.de>
Date: Wed, 26 May 2021 00:08:41 +0200
Subject: [PATCH] Prevent formatting for unknown attribute (#9252)

---
 src/panels/lovelace/cards/hui-entity-card.ts | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/panels/lovelace/cards/hui-entity-card.ts b/src/panels/lovelace/cards/hui-entity-card.ts
index 28c7709926..5c46621b55 100644
--- a/src/panels/lovelace/cards/hui-entity-card.ts
+++ b/src/panels/lovelace/cards/hui-entity-card.ts
@@ -125,11 +125,12 @@ export class HuiEntityCard extends LitElement implements LovelaceCard {
         <div class="info">
           <span class="value"
             >${"attribute" in this._config
-              ? formatAttributeValue(
-                  this.hass,
-                  stateObj.attributes[this._config.attribute!] ??
-                    this.hass.localize("state.default.unknown")
-                )
+              ? stateObj.attributes[this._config.attribute!] !== undefined
+                ? formatAttributeValue(
+                    this.hass,
+                    stateObj.attributes[this._config.attribute!]
+                  )
+                : this.hass.localize("state.default.unknown")
               : stateObj.attributes.unit_of_measurement
               ? formatNumber(stateObj.state, this.hass.locale)
               : computeStateDisplay(