【BUG】空指针引用错误,新成员附加个人介绍进群时可复现

[LennyDream]

环境信息：
go-cqhttp版本: go-cqhttp-v0.9.40
运行环境: windows_amd64
连接方式: 反向WS

BUG内容：
问题重现：当新的成员申请加群，附加"个人介绍"的时候；进群则会发一条个人介绍消息,这时找不到该群成员导致空指针错误

// bot.go:411 
mem := bot.Client.FindGroup(m.GroupCode).FindMember(m.Sender.Uin)

空指针
event error: runtime error: invalid memory address or nil pointer dereference
goroutine 2605 [running]:
runtime/debug.Stack(0x0, 0x0, 0x0)
E:/GoSDK/go1.15/src/runtime/debug/stack.go:24 +0xac
github.com/Mrs4s/MiraiGo/client.cover.func1()
E:/GoSDK/gopath/pkg/mod/github.com/!mrs4s/!mirai![email protected]/client/events.go:421 +0x6f
panic(0x1ab5aa0, 0x21ae300)
E:/GoSDK/go1.15/src/runtime/panic.go:975 +0x414
github.com/Mrs4s/go-cqhttp/coolq.(*CQBot).formatGroupMessage.func1(0x0, 0x0, 0x0)
E:/Code/02Go/01qqrobot/go-cqhttp-master/coolq/bot.go:414 +0x1b
github.com/Mrs4s/go-cqhttp/coolq.(*CQBot).formatGroupMessage(0xc000038f00, 0xc0004cb720, 0x0)
E:/Code/02Go/01qqrobot/go-cqhttp-master/coolq/bot.go:422 +0x13de
github.com/Mrs4s/go-cqhttp/coolq.(*CQBot).groupMessageEvent(0xc000038f00, 0xc000077c00, 0xc0004cb720)
E:/Code/02Go/01qqrobot/go-cqhttp-master/coolq/event.go:96 +0x12a5
github.com/Mrs4s/MiraiGo/client.(*QQClient).dispatchGroupMessage.func1()
E:/GoSDK/gopath/pkg/mod/github.com/!mrs4s/!mirai![email protected]/client/events.go:186 +0x5a
github.com/Mrs4s/MiraiGo/client.cover(0xc0007c9be8)
E:/GoSDK/gopath/pkg/mod/github.com/!mrs4s/!mirai![email protected]/client/events.go:424 +0x56
github.com/Mrs4s/MiraiGo/client.(*QQClient).dispatchGroupMessage(0xc000077c00, 0xc0004cb720)
E:/GoSDK/gopath/pkg/mod/github.com/!mrs4s/!mirai![email protected]/client/events.go:185 +0x105
github.com/Mrs4s/MiraiGo/client.decodeGroupMessagePacket(0xc000077c00, 0xc0004666b4, 0xc000798000, 0x228, 0x228, 0x0, 0x0, 0x0, 0x0)
E:/GoSDK/gopath/pkg/mod/github.com/!mrs4s/!mirai![email protected]/client/group_msg.go:337 +0x7f1
github.com/Mrs4s/MiraiGo/client.(*QQClient).netLoop.func2(0xc000077c00, 0xc000a15090, 0xc000798000, 0x228, 0x228)
E:/GoSDK/gopath/pkg/mod/github.com/!mrs4s/!mirai![email protected]/client/client.go:910 +0x19d
created by github.com/Mrs4s/MiraiGo/client.(*QQClient).netLoop
E:/GoSDK/gopath/pkg/mod/github.com/!mrs4s/!mirai![email protected]/client/client.go:901 +0xed0

[wfjsw]

无法本地复现。请提供发生错误前后至少1分钟的调试日志，并描述错误发生前后你的所有操作。

[Mrs4s]

尝试复现失败, 暂时合了个临时解决方案, 需要更多信息