What should I do if I forgot to file my 90-day report in Thailand before my flight?

The user forgot to file their 90-day report in Thailand and is concerned about the consequences as their flight back to Europe is imminent. Commenters reassured them that leaving Thailand would not pose any issues, as immigration does not check for 90-day report compliance upon exit. However, upon returning to Thailand, the user should expect to pay a 2,000 baht fine for the late filing when they report next time.