diff --git a/longtasks/longtasks.py b/longtasks/longtasks.py
index 6d9f7cb..fd8f38b 100644
--- a/longtasks/longtasks.py
+++ b/longtasks/longtasks.py
@@ -1,4 +1,5 @@
 # -*- coding:utf-8 -*-
+from traceback import format_exc
 import asyncio
 import aioredis
 from random import randint
@@ -170,6 +171,7 @@ class LongTasks:
 					})
 					# 从 processing_queue 移除该项
 					await self.redis.lrem(self.processing_queue, 1, task_id)
+					debug(f'{e=}\n{format_exc()}')
 					continue
 
 				# 3) 写回成功结果并移除 processing_queue 项