Musescore keeps crashing when i try to remove a measure

In general, I can guess that the measure contains a corruption of some sort. Hard to say anything more specific without seeing the score in question.

What procedure are you using to 'remove' the measure? Are you using CTL+DEL, or are you 'cutting' it with the clipboard? CTL+DEL actually removes the selected measure from the score; CUT applied to a selected measure only removes the notes, rests, etc., from the measure but leaves the measure itself in the score.

If it is CTL+DEL that's causing the program to crash, you might try getting rid of the unwanted material using CUT instead. Highlight the measure (all staves), then right-click>CUT. This will leave you with a blank measure in the middle of the score (I presume you're trying to remove a measure somewhere other than the very end of the piece), so you then CUT the rest of the score (which copies it to the clipboard), and then paste it back into the score starting in that blanked measure. Then go to the end of the score and delete the last measure using CTL+DEL. See if that makes a difference.

PS--Make a copy of the score under a new name and do your experimenting on that file; that way if anything goes wrong you haven't lost your work on the original score.