Segmentation violation at "wifi.recon.channel clear" command

[MartinRJ]

Crash when issuing wifi.recon.channel clear

Environment

• Bettercap version v2.26.1
• Kali GNU/Linux Rolling, Release 2019.4 (AMD 64)
• Go version go1.13.4 linux/amd64
• Command line argument: wifi.recon.channel clear
• Full debug output while reproducing the issue:

192.168.0.0/24 > 192.168.0.56  » wifi.recon.channel clear

Stopping modules and cleaning session state ...
[01:00:47] [session.closing] {session.closing 2019-11-24 01:00:47.612673391 +0100 CET m=+4.180199428 <nil>}
[01:00:47] [sys.log] [dbg] wifi resetting hopping channels
[01:00:47] [mod.stopped] events.stream
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x90 pc=0xf40492]

goroutine 1 [running]:
github.com/bettercap/bettercap/network.(*Endpoint).Name(...)
	/home/git/go/src/github.com/bettercap/bettercap/network/lan_endpoint.go:125
github.com/bettercap/bettercap/modules/wifi.NewWiFiModule.func16(0xc0004b60d0, 0x1, 0x1, 0xc00080ba20, 0xc00080ba88)
	/home/git/go/src/github.com/bettercap/bettercap/modules/wifi/wifi.go:357 +0x372
github.com/bettercap/bettercap/session.(*ModuleHandler).Exec(0xc000198940, 0xc0004b60d0, 0x1, 0x1, 0x0, 0x0)
	/home/git/go/src/github.com/bettercap/bettercap/session/module_handler.go:74 +0xa3
github.com/bettercap/bettercap/session.(*Session).Run(0xc0004de4e0, 0xc000034c80, 0x18, 0x1, 0x1)
	/home/git/go/src/github.com/bettercap/bettercap/session/session.go:416 +0x6ae
main.main()
	/home/git/go/src/github.com/bettercap/bettercap/main.go:94 +0x977

Steps to Reproduce

1. Start bettercap: sudo bettercap -debug
2. Issue command: wifi.recon.channel clear

Expected behavior: What you expected to happen
Wifi recon channels are reset to default.

Actual behavior: What actually happened
Application crashes.