Invalid API key does not return any error when calling Enqueue()

[mbn18]

I expect an Error when a Client is created with a bad apiKey. but none return when I call Enqueue()

	err := f.cli.Enqueue(posthog.Capture{
		DistinctId: user.GetDistinctId(),
		Event:      "$set",
		Properties: map[string]interface{}{
			"$set": user.GetMap(),
		},
	})

On bad apiKey nothing happens. The user is created when it is correct.

Also tried to set Callback in the Config, but it executed the Success(message posthog.APIMessage) implementation.

type Callback struct {}

func (m Callback) Success(message posthog.APIMessage) {
	println(fmt.Sprintf("----message\n%v", message))
}

func (m Callback) Failure(message posthog.APIMessage, err error) {
	println(fmt.Sprintf("----message\n%v", message))
	println(fmt.Sprintf("----error\n%s", err.Error()))
}

Is it possible to get an error when the apiKey is wrong? or maybe its a bug?