From 55da551971eab4f29b7d73bf70cc79c7da988361 Mon Sep 17 00:00:00 2001
From: WrBug <iwrbug@gmail.com>
Date: Sat, 31 Jan 2026 21:10:10 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20=E4=BF=AE=E5=A4=8D=E5=9B=9E=E6=B5=8B?=
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- 修复 calculateStatistics 在 trades 为空时的 IndexOutOfBoundsException
- 添加空列表检查，避免访问 trades[0]
- 确保回测任务即使没有交易记录也能正常完成
---
 .../service/backtest/BacktestExecutionService.kt            | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/backend/src/main/kotlin/com/wrbug/polymarketbot/service/backtest/BacktestExecutionService.kt b/backend/src/main/kotlin/com/wrbug/polymarketbot/service/backtest/BacktestExecutionService.kt
index e70ad20..ecab300 100644
--- a/backend/src/main/kotlin/com/wrbug/polymarketbot/service/backtest/BacktestExecutionService.kt
+++ b/backend/src/main/kotlin/com/wrbug/polymarketbot/service/backtest/BacktestExecutionService.kt
@@ -590,7 +590,11 @@ class BacktestExecutionService(
         var maxLoss = BigDecimal.ZERO
 
         // 计算最大回撤
-        var runningBalance = trades[0]?.balanceAfter?.toSafeBigDecimal() ?: BigDecimal.ZERO
+        var runningBalance = if (trades.isNotEmpty()) {
+            trades[0].balanceAfter?.toSafeBigDecimal() ?: BigDecimal.ZERO
+        } else {
+            BigDecimal.ZERO
+        }
         var peakBalance = runningBalance
         var maxDrawdown = BigDecimal.ZERO