[Fix]Close #881
[Fix]Close #881

rrrrrr8/vnpy,msincenselee/vnpy,msincenselee/vnpy,msincenselee/vnpy,bigdig/vnpy,rrrrrr8/vnpy,rrrrrr8/vnpy,andrewchenshx/vnpy,bigdig/vnpy,harveywwu/vnpy,vnpy/vnpy,vnpy/vnpy,andrewchenshx/vnpy,bigdig/vnpy,andrewchenshx/vnpy,andrewchenshx/vnpy,rrrrrr8/vnpy,rrrrrr8/vnpy,harveywwu/vnpy,harveywwu/vnpy,harveywwu/vnpy,bigdig/vnpy,rrrrrr8/vnpy,andrewchenshx/vnpy,harveywwu/vnpy,msincenselee/vnpy,harveywwu/vnpy