New Scene view created on play

I am using pro builder as well as pro grid to make a 3d platformer but when I hit play (sometimes not always) a new scene view will open up and a cube will be created in the center of my scene, closing this new scene view will close it AND my scene view that I work in and it will spam my console with errors MissingReferenceException: The object of type ‘Camera’ has been destroyed but you are still trying to access it.
Your script should either check if it is null or you should not destroy the object.

The only way I have found to stop these errors is by pressing play then making a new scene view and putting it where i usually have it.
This is a really difficult issue to work with, if anyone knows a solution please tell me!

Do you have a script in your scene who create a new one in a Start() or Awake() function somewhere ?