Does anyone dnow why the Undertale game crashed my PC? And is that supposed to happen or is it an error?

Well, gaming hasn’t changed that much that computer crashing is considered a feature. It happens, make sure you reboot your machine and follow good cleanup process and you will not get that very much.

Can you provide more information?

- System specs
- When in the game it happens
- Other programs that are running at the time that could be conflicting with the game.

Probably hw error.
There is no good cleanup process btw.
Eighter driver problem or game problem, no cleanup can fix those. I dont even get what cleanups do , remove some old registry data? That only slows down the registry a very little, nearly nothing.

You have to be very specific in this case. Pick what happened:

1. You entire PC crashed while playing Undertale (error messages and your system became unresponsive)
or
2. Undertale crashed while playing it. No error messages, the game just closed down. Maybe at what appeared to be near the end of the game.

If #1: You system has something wrong with it.
If #2: There are sections of this game which intentionally closes like it crashed. When you start it back up the game will continue where you left off. It's a meta thing.

It sounds like his PC crashed, not just the game.

So possibly a hardware failure. My gaming rig crashes from time to time, a reboot usually deals with the problems (even if i just resumed it from sleep/hibernation)

Though i found my PC really dislikes cold, so maybe the weather has something to do with it.

As I said recently on another thread, usually computer not correctly starting while cold and/or random crashes are typical symptoms of a faulty power delivery system and are very similar to a unstable overclock. Those are related to capacitors aging in PSU or motherboards, specially if a few years old (urban legend says that a badly formulated eletrolyte caused all the problem since the Pentium 2/3 era right until the i* line).
This may or not be the case and probably wont help the OP but just throw it in the discission...

Yes, I know why

did you by any chance un install the old game and put in a fresh new install of it?

I'd be very impressed that a basic Gamemaker engined game would crash anyone's PC, so that's what I'd be agreeing on if it was a correctly described crash. Not quite an urban legend. Whatever the case may be, there was a plague of faulty caps made for a while until the recent times.

Yeah, don't worry - it's a feature, not a bug.

;)

My system is fairly new, i think a year or two at most.

I used to have the hardest time with the ram with this Gigabyte motherboard, where it would restart 4 times before it would show the bios flash screen and then boot to the OS. It's slowly gotten better. (Setting exact settings per what the ram says helps a lot more) So it's hard to tell.

I can't recall overclocking more than neccesary just to get it to work.

On the other hand, this IS an older house so might have some older electrical in places. While i have it on a surge protector maybe it's getting lower fluctuations...

Do you have porn on your hard drive?