> Still an issue. The try/catch doesn't correct the behavior.
I was able to fix the null reference exception by creating a new toolwindow if it's null.
I still don't know why it goes null to begin with, but it does have something to do with closing the window via the x button.
Interestingly enough, the Test Explorer does not suffer from this issue. If we can figure out why it works, maybe we can figure out why there's an issue with TodoExplorer and CodeExplorer.