From 417a52138d9ae00c1c63b23e9a1e9abf590e2d75 Mon Sep 17 00:00:00 2001
From: spacemeowx2 <spacemeowx2@gmail.com>
Date: Mon, 17 Jul 2023 15:33:32 +0800
Subject: [PATCH] fix: skip updateState if history if empty (#81)

---
 src/RankTracker.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/RankTracker.ts b/src/RankTracker.ts
index 145d7a0..241dbb4 100644
--- a/src/RankTracker.ts
+++ b/src/RankTracker.ts
@@ -347,6 +347,10 @@ export class RankTracker {
   async updateState(
     history: HistoryGroups<BattleListNode>["nodes"],
   ) {
+    if (history.length === 0) {
+      return;
+    }
+
     // history order by time. 0 is the oldest.
     const flatten: FlattenItem[] = await Promise.all(
       history