NullReferenceException: Object reference not set to an instance of an object

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i was getting this error and i check everything twice and found a way to fix this either you comment DisplayAnswer(-1); this line of code or add currentQuestion = ScriptableObject.CreateInstance(); this line in start it works for me and i hope it will work for you as well
NullReferenceException: Object reference not set to an instance of an object Quiz.DisplayAnswer (System.Int32 Index) (at Assets/Scripts/Quiz.cs:60)
Quiz.Update () (at Assets/Scripts/Quiz.cs:44)

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Had the same issue too. It seams there is a race condition between the timer script and the quiz script. The Quiz update is being called before the Timer Updates first iteration.

I fixed it by doing

 else if(!hasAnsweredEarly && !timer.isAnsweringQuestion && currentQuestion != null)

in the Quiz Update method

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I had the same issue here and solved with your comment I cleared my mind and solved this problem in code, thank you very much for your help.

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ty for pointing me in the right direction. with me even with extra && it was giving me a bug that flashed the default screen at start of game, so I added.
void Awake()

{

    updateTimer();    

}

to Timer script this worked to resolve bug by making sure that timer won the race of who is on first. but still use extra check to be on safe side