[Python] Why do I get a BadAlloc error from pygame.display.set_mode()?

I installed Thonny and tried running my Python project, but I get an error from this line:

fenster=pygame.display.set_mode((Multiplikator*W, Multiplikator*H))


Multiplikator, W and H are defined further up in the code. I get:

X Error: BadAlloc
Request Major code 149 ()
Request Minor code 2
Error Serial #165
Current Serial #166

Process ended with exit code 1.


Previously this code would run fine. Is it because I am using a newer version of Thonny? BadAlloc is related to system resources being too low, but the laptop has 16GB RAM and only about 2.5 are used. NumPy and Pygame are correctly installed.

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