auth.Client.CreateUser(...) panics if email is already in use in project

[StainlessStlRat]

[REQUIRED] Step 2: Describe your environment

• Operating System version: Mac OSX Monterey & Docker debian
• Firebase SDK version: 4.7.1
• Library version: 4.7.1
• Firebase Product: auth

[REQUIRED] Step 3: Describe the problem

Steps to reproduce:

Attempt to create a user whose email is already in use with the project configured for only one account per email

Relevant Code:

// RegisterUser register a user with firebase
func RegisterUser(email string, password string, handle string) (UID string, err error) {
    params := (&auth.UserToCreate{}).
        Email(email).
        EmailVerified(false).
        Password(password).
        DisplayName(handle).
        Disabled(false)
    userRecord, err := authClient.CreateUser(context.Background(), params)
    return userRecord.UID, err
}

[lahirumaramba]

I think it panics because you try to access UID in a null userRecord. You can handle the errors as below:

userRecord, err := authClient.CreateUser(context.Background(), params)
if err != nil {
    log.Fatalln("Error when registering user: ", err)
}
return userRecord.UID