关于断开网络连接之后S端被K的问题.

[iMarcs]

`panic: close of nil channel

goroutine 43 [running]:
panic(0x837c4c0, 0x18ca8178)
/home/wcl/.gvm/gos/go1.7.4/src/runtime/panic.go:500 +0x331
github.com/fatedier/frp/src/models/server.(*ProxyServer).Release(0x18d10000)
/home/wcl/go_projects/src/github.com/fatedier/frp/src/models/server/server.go:301 +0xd4
github.com/fatedier/frp/src/models/server.(*ProxyServer).Close(0x18d10000)
/home/wcl/go_projects/src/github.com/fatedier/frp/src/models/server/server.go:283 +0x61
main.controlWorker.func1(0x1893ef17, 0x18be0570, 0x1893ef40)
/home/wcl/go_projects/src/github.com/fatedier/frp/src/cmd/frps/control.go:53 +0x43
main.controlWorker(0x18be0570)
/home/wcl/go_projects/src/github.com/fatedier/frp/src/cmd/frps/control.go:94 +0x5a0
created by main.ProcessControlConn
/home/wcl/go_projects/src/github.com/fatedier/frp/src/cmd/frps/control.go:40 +0xfd
`

这是PC端断开网络之后重新连接上导致S端挂.之后出现以上的信息.

Centos 7.1 系统 使用 screen