Crash in ServeDHCP after boot

[bboreham]

Stack trace:

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x8 pc=0xcc15be]
goroutine 12 [running]:
github.com/weaveworks/ignite/pkg/container.(*DHCPInterface).ServeDHCP(0xc0001868c0, 0xc0001bec00, 0x224, 0x5dc, 0x201, 0xc000639e90, 0xc0006
39e60, 0x0, 0x0)
        /go/src/github.com/weaveworks/ignite/pkg/container/dhcp.go:93 +0x22e
github.com/krolaw/dhcp4.Serve(0x7f8aed51edc0, 0xc000657058, 0x1064740, 0xc0001868c0, 0xc000657058, 0xc000657058)
        /go/src/github.com/weaveworks/ignite/vendor/github.com/krolaw/dhcp4/server.go:63 +0x1a7
github.com/weaveworks/ignite/pkg/container.(*DHCPInterface).StartBlockingServer(0xc0001868c0, 0x4, 0xf2f4e5)
        /go/src/github.com/weaveworks/ignite/pkg/container/dhcp.go:73 +0xc6
github.com/weaveworks/ignite/pkg/container.StartDHCPServers.func1(0xc0001868c0)
        /go/src/github.com/weaveworks/ignite/pkg/container/dhcp.go:47 +0x11c
created by github.com/weaveworks/ignite/pkg/container.StartDHCPServers
        /go/src/github.com/weaveworks/ignite/pkg/container/dhcp.go:45 +0x194

I haven't investigated yet.