From 1307d637ec639ff609d6326248cdd693c83211cb Mon Sep 17 00:00:00 2001
From: "vn.py" <vn.py@foxmail.com>
Date: Fri, 15 Dec 2017 20:30:19 +0800
Subject: [PATCH] [Fix]Close #638

---
 vnpy/trader/vtFunction.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/vnpy/trader/vtFunction.py b/vnpy/trader/vtFunction.py
index acd7405c..dafee913 100644
--- a/vnpy/trader/vtFunction.py
+++ b/vnpy/trader/vtFunction.py
@@ -8,18 +8,18 @@ import os
 import decimal
 import json
 from datetime import datetime
+from math import isnan
 
 
 MAX_NUMBER = 10000000000000
 MAX_DECIMAL = 4
 
-
 #----------------------------------------------------------------------
 def safeUnicode(value):
     """检查接口数据潜在的错误，保证转化为的字符串正确"""
     # 检查是数字接近0时会出现的浮点数上限
     if type(value) is int or type(value) is float:
-        if value > MAX_NUMBER:
+        if value > MAX_NUMBER or isnan(value):
             value = 0
     
     # 检查防止小数点位过多