1. Install Unity 2018.1.5.f1 (the latest release as of this report).

2. Start up Unity and create a new 2D Unity project.

3. Install the latest NoesisGUI Unity package (2.1.0f1) into the project.

4. Load the ControlGallery scene from the NoesisGUI Samples folder.

5. In the Assets/NoesisGUI/Samples/ControlGallery/MainWindow.xaml.cs file, insert the following two lines at the start of the LoadSample method:

string s = null;
string t = "x" + s.Length;

6. Run the program in the Unity editor. Click on the menu icon in the upper left, and pick any individual item (not submenu) from within the dropdown list. This will execute the above code, causing an exception which causes the Unity editor to crash.