Panic error

[tasir13]

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0x68b5f6]

goroutine 1 [running]:
main.main()
/home/tasir/go/pkg/mod/github.com/gwen001/github-subdomains@v0.0.0-20210415092836-636297267fb6/main.go:373 +0x1916

I got this error

[Phoenix1112]

i have same problem