1- I download the game 2 days ago on this main pageThe mentioned bug happens when the player has KAV on the PC. I assumed that you have it.
Anyway, if you need assistance, I need more information about the bug you've experienced.
1 - What version of the game do you have?
2 - Did you use any external cheat and trainers?
3 - What AV do you have?
4 - Do you use MAC or Win version?
2- Just your game, no mod or something else
3- If AV means Anti-virus, the answer is none
4- windows 10-64 bits