Trouble ending the application?

Question

Java

I am using globaldata singleton. In it, I save links to screen objects (gdx.screen) and operate with these links when switching screens ( setscreen(globaldata.getscreenX()) ). There was a problem, I can understand. When I exit the game, everything seems to be working normally. Gdx.app.exit() is processed. But on the next start, a black screen and everything is silent. Profiling showed that despite the "exit" the process still hangs in memory.
How can I overcome this crap?