diff --git a/src/system/game-data.ts b/src/system/game-data.ts
index e7bc85d9037..d10d6288696 100644
--- a/src/system/game-data.ts
+++ b/src/system/game-data.ts
@@ -635,13 +635,13 @@ export class GameData {
   async saveRunHistory(scene: BattleScene, runEntry : SessionSaveData, isVictory: boolean): Promise<boolean> {
     const runHistoryData = await this.getRunHistoryData(scene);
     // runHistoryData should always return run history or {} empty object
-    const timestamps = Object.keys(runHistoryData);
-    const timestampsNo = timestamps.map(Number);
+    let timestamps = Object.keys(runHistoryData).map(Number);
 
     // Arbitrary limit of 25 entries per user --> Can increase or decrease
     while (timestamps.length >= RUN_HISTORY_LIMIT ) {
-      const oldestTimestamp = Math.min.apply(Math, timestampsNo);
+      const oldestTimestamp = (Math.min.apply(Math, timestamps)).toString();
       delete runHistoryData[oldestTimestamp];
+      timestamps = Object.keys(runHistoryData).map(Number);
     }
 
     const timestamp = (runEntry.timestamp).toString();