panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x48 pc=0x2e27]
goroutine 1 [running]:
panic(0x23c660, 0xc42000c0a0)
/usr/local/Cellar/go/1.7.4_1/libexec/src/runtime/panic.go:500 +0x1a1
main.goCrawl(0xc4200a4120, 0xfffffffffb3cdd4c, 0x569, 0xc4203fe160, 0x1, 0x1)
/Users/YamiOdymel/go/src/github.com/yamiodymel/test/main.go:151 +0x687
main.main()
/Users/YamiOdymel/go/src/github.com/yamiodymel/test/main.go:199 +0x33e
exit status 2