Assertion failed: Assertion failed on expression: 'IsActive() || GetRunInEditMode()' What does this mean?

Question

I am using the code below and although it works perfectly i get this error whenever i press the button on my keyboard. Is this a bug of the engine or something wrong with my code?

 private void OnGUI()
     {
         if (pistol_button)
         {
             if(GUI.Button(new Rect(20, Screen.height - 50, 100, 50), "1. Pistol") || Input.GetKeyDown(KeyCode.Alpha1))
             {
                 child1.SetActive(true);
                 child2.SetActive(false);
             }
         }
         if (shotgun_button)
         {
             if(GUI.Button(new Rect(140, Screen.height - 50, 100, 50), "2. Shotgun") || Input.GetKeyDown(KeyCode.Alpha2))
             {
                 child2.SetActive(true);
                 child1.SetActive(false);
             }
         }
     }

Answer 1

Answer by Aristonaut · Aug 02, 2019 at 09:58 PM

This seems to happen when calling SetActive() in the OnGUI() function. You could call SetActive() in Update() instead, or delay the deactivation till the end of the frame using a coroutine:

     private void OnGUI()
     {
         ...
         StartCoroutine( SetActiveLater(false) );
         ...
     }
 
     private IEnumerator SetActiveLater(bool value)
     {
         yield return null;
         gameObject.SetActive( value );
     }

By delaying activations and deactivations till the next coroutine call, you won't get OnGUI being called in strange orders where your state has not fully propagated through (like where a dependent thing has it's OnGUI called first, then gets deactivated.)

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Assertion failed: Assertion failed on expression: 'IsActive() || GetRunInEditMode()' What does this mean?

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