EditorApplication.OpenScene causing NullReferenceException

[Steven-Walker]

I’m creating an editor window that includes functions for opening scenes. It’s working and the scenes open, but I’m getting null reference errors that I can’t get rid of:

NullReferenceException: Object reference not set to an instance of an object
UnityEditor.DockArea.EndOffsetArea ()
UnityEditor.DockArea.OnGUI ()

Anyone know how to fix this?

Below is a script I’ve tested in a new project. The test scenes have nothing in them except a cube and a sphere.

class TestWindow extends EditorWindow {
	@MenuItem("Window/TestWindow")
	static function Init() {
		var window : TestWindow = EditorWindow.GetWindow(TestWindow);
	}

	function OnGUI() {
		var openTest1 : boolean = false;
		EditorGUILayout.BeginHorizontal();
		if(GUILayout.Button("Test1", EditorStyles.toolbarButton, GUILayout.Width(100))) {
			openTest1 = true;
			//EditorApplication.SaveCurrentSceneIfUserWantsTo();
			//EditorApplication.OpenScene("Assets/Test1.unity");
			//return;
		}
		if(GUILayout.Button("Test2", EditorStyles.toolbarButton, GUILayout.Width(100))) {
			EditorApplication.SaveCurrentSceneIfUserWantsTo();
			EditorApplication.OpenScene("Assets/Test2.unity");
			return;
		}
		EditorGUILayout.EndHorizontal();

		if(openTest1) {
			EditorApplication.SaveCurrentSceneIfUserWantsTo();
			EditorApplication.OpenScene("Assets/Test1.unity");
		}
	}
}

[Steven-Walker]

EditorGUIUtility.ExitGUI();