go-outline SIGSEGV on Ubuntu 18.10

[lawipac]

sp@patrick-desktop:~$ ^C
sp@patrick-desktop:~$ go-outline 
error: Could not parse file 
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x5438a6]

goroutine 1 [running]:
main.main()
        /home/sp/data/workspace/go/src/github.com/ramya-rao-a/go-outline/main.go:63 +0x256
sp@patrick-desktop:~$ go get -u github.com/lukehoban/go-outline
sp@patrick-desktop:~$ go-outline 
error: Could not parse file 
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x4e8ed0]

goroutine 1 [running]:
main.main()
        /home/sp/data/workspace/go/src/github.com/lukehoban/go-outline/main.go:53 +0x140