diff --git a/src/panels/lovelace/editor/config-elements/hui-statistic-card-editor.ts b/src/panels/lovelace/editor/config-elements/hui-statistic-card-editor.ts
index 267b4745f304..0287be386251 100644
--- a/src/panels/lovelace/editor/config-elements/hui-statistic-card-editor.ts
+++ b/src/panels/lovelace/editor/config-elements/hui-statistic-card-editor.ts
@@ -196,7 +196,7 @@ export class HuiStatisticCardEditor
   }
 
   private async _valueChanged(ev: CustomEvent) {
-    const config = ev.detail.value as StatisticCardConfig;
+    const config = { ...ev.detail.value } as StatisticCardConfig;
     Object.keys(config).forEach((k) => config[k] === "" && delete config[k]);
 
     if (typeof config.period === "string") {