Mình có dùng thử billing này thì báo lỗi như sau khi login account, cho mình hỏi fix ra sao ạ.
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0x6fcb64]

goroutine 19 [running]:
github.com/liuguangw/billing_go/bhandler.(*LoginHandler).GetResponse(0xc000212008, 0xc0000247c0)
/home/BillingGO/bhandler/login_handler.go:147 +0x7e4
github.com/liuguangw/billing_go/services/handle.(*ConnHandle).HandleConnection(0xc000222080 , 0xc000212040)
/home/BillingGO/services/handle/handle_connection.go:39 +0x3b0
created by github.com/liuguangw/billing_go/services/billing.(*Server).runAcceptLoop
/home/BillingGO/services/billing/run_accept_loop.go:23 +0x1de