Help with Game Loop

[Sanction]

So I was working on game states a few weeks ago and I couldn't get the game states to transition. after look at the code and walking threw it, I never render I'm stuck within my loop and I don't remember what I changed.

Can anyone see what is wrong with this game loop? I'm stuck in the nested while loop.

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        sf::Clock clock;
        _deltaTime = clock.getElapsedTime();
        while (_window->isOpen())
        {
                _deltaTime += clock.restart();
                while (_deltaTime.asSeconds() >= _frameTime)
                {
                        if (currentState() == nullptr) continue;
                        currentState()->handleInput();
                        currentState()->update(_deltaTime);
                        _deltaTime += clock.restart();
                }
                //_CollisionSystem->update(_entities);
                //_LevelManager->update(_deltaTime);
                currentState()->render(_deltaTime);
        }
 

[Laurent]

currentState() == nullptr maybe?

Otherwise just execute your code step by step, watch the value of the variables involved in the condition, and simply see what happens.