Thank you for your answer! Unfortunately, this solution didn't solve the problem for me :/ I tried to set the resolution at the lowest value and even set graphics on low tier and the crash still happens. I have an AMD GPU, could it be some kind of incompatibility ?

Hi! I'm having crashes on Schthack PSOBB:
- I was doing main quest 1-1 Episode 1 in Hard mode and when I use a gun, the game crashes instantly (I could use guns without trouble in Normal mode)
- I was able to finish quests 1-1 and 1-2 without using guns but in quest 1-3, during the boss fight, when ...