diff --git a/src/data/history.ts b/src/data/history.ts
index 6fcb8ad9f1..27a1f6ada9 100644
--- a/src/data/history.ts
+++ b/src/data/history.ts
@@ -238,7 +238,7 @@ class HistoryStream {
       newHistory[entityId] = [];
     });
     Object.keys(newHistory).forEach((entityId) => {
-      let purgeOld = false;
+      let purgeOld = entityId in this.combinedHistory;
       if (
         entityId in this.combinedHistory &&
         entityId in streamMessage.states