机器人异常终止

[witpark]

环境信息
请根据实际使用环境修改以下信息
go-cqhttp版本: v0.9.26
运行环境: windows_amd64
连接方式: http

bug内容
panic: interface conversion: interface {} is nil, not client.groupMemberListResponse

goroutine 53281 [running]:
github.com/Mrs4s/MiraiGo/client.(*QQClient).GetGroupMembers(0xc000173340, 0xc018113f00, 0x43f5cd, 0xd0d9f0, 0xc000173408
, 0xc001331310, 0xc000173340)
/go/pkg/mod/github.com/!mrs4s/!mirai!go@v0.0.0-20200926101830-afb0ed6368ad/client/client.go:766 +0x2fc
github.com/Mrs4s/MiraiGo/client.(*QQClient).GetGroupList.func1(0xc000173340, 0xc018113f00, 0xc002402830)
/go/pkg/mod/github.com/!mrs4s/!mirai!go@v0.0.0-20200926101830-afb0ed6368ad/client/client.go:746 +0x68
created by github.com/Mrs4s/MiraiGo/client.(*QQClient).GetGroupList
/go/pkg/mod/github.com/!mrs4s/!mirai!go@v0.0.0-20200926101830-afb0ed6368ad/client/client.go:744 +0x139

复现方法
请在这里分步骤的描述如何复现这个bug