slack crash on connect

[Peter4825]

Using latest head (0.16.5-dev)

panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0x8452fe]

goroutine 20 [running]: github.com/42wim/matterircd/vendor/github.com/42wim/mm-go-irckit.(User).syncSlackChannel(0xc420186000, 0xc42049d4e0, 0x9, 0xc42001b2e5, 0x6) /home/peter/.programs/gopath/src/github.com/42wim/matterircd/vendor/github.com/42wim/mm-go-irckit/slackuser.go:211 +0xee github.com/42wim/matterircd/vendor/github.com/42wim/mm-go-irckit.(User).(github.com/42wim/matterircd/vendor/github.com/42wim/mm-go-irckit.syncSlackChannel)-fm(0xc42049d4e0, 0x9, 0xc42001b2e5, 0x6) /home/peter/.programs/gopath/src/github.com/42wim/matterircd/vendor/github.com/42wim/mm-go-irckit/server_commands.go:153 +0x52 github.com/42wim/matterircd/vendor/github.com/42wim/mm-go-irckit.CmdJoin(0x9c0440, 0xc420079520, 0xc420186000, 0xc420081b30, 0xc4200e3888, 0x1) /home/peter/.programs/gopath/src/github.com/42wim/matterircd/vendor/github.com/42wim/mm-go-irckit/server_commands.go:157 +0x280 github.com/42wim/matterircd/vendor/github.com/42wim/mm-go-irckit.commands.Run(0xc420163350, 0x9c0440, 0xc420079520, 0xc420186000, 0xc420081b30, 0x9bc960, 0xc42005cd80) /home/peter/.programs/gopath/src/github.com/42wim/matterircd/vendor/github.com/42wim/mm-go-irckit/commands.go:51 +0x1d3 github.com/42wim/matterircd/vendor/github.com/42wim/mm-go-irckit.(server).handle.func1(0xc420079520, 0xc420186000, 0xc420081b30, 0xc4201b4190) /home/peter/.programs/gopath/src/github.com/42wim/matterircd/vendor/github.com/42wim/mm-go-irckit/server.go:368 +0x7a created by github.com/42wim/matterircd/vendor/github.com/42wim/mm-go-irckit.(server).handle /home/peter/.programs/gopath/src/github.com/42wim/matterircd/vendor/github.com/42wim/mm-go-irckit/server.go:367 +0x107