From 7ca9b8da1f171694104be84100be7ec1c2dcac48 Mon Sep 17 00:00:00 2001
From: "vn.py" <vn.py@foxmail.com>
Date: Tue, 31 Oct 2017 21:33:01 +0800
Subject: [PATCH] [Fix]Close #569

---
 vnpy/trader/vtEngine.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/vnpy/trader/vtEngine.py b/vnpy/trader/vtEngine.py
index 1aec3a7f..f0122ace 100644
--- a/vnpy/trader/vtEngine.py
+++ b/vnpy/trader/vtEngine.py
@@ -340,7 +340,8 @@ class MainEngine(object):
     #----------------------------------------------------------------------
     def registerLogEvent(self, eventType):
         """注册日志事件监听"""
-        self.eventEngine.register(eventType, self.logEngine.processLogEvent)
+        if self.logEngine:
+            self.eventEngine.register(eventType, self.logEngine.processLogEvent)
     
     #----------------------------------------------------------------------
     def convertOrderReq(self, req):