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Question by Socapex · Aug 14, 2014 at 05:06 PM · nullreferenceexceptionnull

Testing if object is null creates a NullReferenceException.

Hello, I want to access an object from a component which I purposefully set to null in the constructor (Start()). It is part of a doubly linked list, and as such the first and last objects will be null. The problem is so... ridiculous. When accessing the object to test if it is null, I get a NullReferenceException. Is there any way to fix that (please say yes). :)

 void LateUpdate()
 {
     // Call the follow script on children after we have moved.
     GameObject child = GetComponent<Attach>().myChild;
     if (child != null)
         child.GetComponent<Attach>().followParent();
 }

It will throw the error on the first GetComponent line.

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avatar image stuart6854 · Aug 14, 2014 at 05:09 PM 0
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GetComponent() might be returning null.

Try this: GameObject child = GetComponent() if(child != null) child = child.myChild; if (!child) return;

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Answer by robertbu · Aug 14, 2014 at 05:12 PM

The problem is that this:

  GetComponent<Attach>()

...is failing to find the 'Attach' component on the same game object with this script. Most likely reasons based on similar questions on this list:

  • The 'Attach' script is on another game object

  • The 'Attach' script was never attached to this game object

  • You have the above script on multiple game objects, but at least one does not have the 'Attach' script.

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avatar image Socapex · Aug 14, 2014 at 05:15 PM 0
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Bang on! The component was in a child of my Player... I forgot that. Thank you very much!

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