panic: runtime error: index out of range

goroutine 1 [running]:
github.com/boyter/lc/parsers.walkDirectory(0x5c4a12, 0x1, 0xc42004f908, 0x0, 0x0, 0x0, 0x564a6d, 0xc4200b8420)
	~/go/src/github.com/boyter/lc/parsers/guesser.go:249 +0xf3e
github.com/boyter/lc/parsers.Process()
	~/go/src/github.com/boyter/lc/parsers/guesser.go:343 +0x5b8
main.main.func1(0xc4200b8420, 0xc4200b8420, 0xc4200479b7)
	~/go/src/github.com/boyter/lc/main.go:89 +0x5e
github.com/boyter/lc/vendor/github.com/urfave/cli.HandleAction(0x58eda0, 0xaa4ae8, 0xc4200b8420, 0xc42005a1e0, 0x0)
	~/go/src/github.com/boyter/lc/vendor/github.com/urfave/cli/app.go:490 +0xd2
github.com/boyter/lc/vendor/github.com/urfave/cli.(*App).Run(0xc420082820, 0xc42000e250, 0x1, 0x1, 0x0, 0x0)
	~/go/src/github.com/boyter/lc/vendor/github.com/urfave/cli/app.go:264 +0x635
main.main()
	~/go/src/github.com/boyter/lc/main.go:93 +0x9c9