Mailer auth routine cause an panic

[vit1251]

[user@rm-op-18 golden]$ ./golden-linux-amd64
Golden Point is running at:

    http://127.0.0.1:8080 

Note: You MUST setup your instalattion on first run.
Please open 'Setup' section initially.
panic: encoding/hex: invalid byte: U+0080

goroutine 26 [running]:
github.com/vit1251/golden/pkg/mailer/auth.(*Authorizer).SetChallengeData() github.com/vit1251/golden/pkg/mailer/auth/Authorization.go:55 +0x99
github.com/vit1251/golden/pkg/mailer.(*Mailer).createAuthorization() github.com/vit1251/golden/pkg/mailer/Mailer.go:248 +0x65
...