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MaskRay / wechatircd

㊙用IRC客户端控制微信网页版
https://maskray.me/blog/2016-02-21-wechatircd
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I do not know in what situation old is null, but this patch fix things up #32

Closed zTrix closed 7 years ago

zTrix commented 7 years ago

as title

zTrix commented 7 years ago

would cause null reference exception if no check performed