Npp crash when exiting application

[Ekopalypse]

While preparing for testing this PR I figured out that the plugin is causing npp to crash on exit. This does NOT happen if PoorMansTSqlFormatter is the ONLY plugin loaded, so it must be a combination of plugins loaded. EventViewer reports crash of .Net runtime and then crash of Npp application. If there is any information you can provide to find out which combination of plugins is causing it I'm willing to test.