Swift if statement giving wrong answer

I have an if statement that is returning the wrong value and is therefore running code it shouldn't. I am so confused over this, the value of currentPowerup is not empty so it should not be running the code.

override func update(_ currentTime: TimeInterval) {
    //called every frame

    if GameScene.score >= 1{
        //When it prints this, currentPower is "rocket" but it then goes ahead with the if statement resulting in true when it is false
        print(currentPowerup)
        if currentPowerup == ""{
            if HasPowerup == false{
                createPowerupLocation()
                HasPowerup = true
            }
        }
    }
}

Thanks