For me: I make sure that exporting is ONLY local, and not to social media (upload separately)
Are there any stange pieces of footage in your sequence? Have you tried playing back the entire sequence on the timeline? A bad piece of media (or protected media) can halt the export process. It shouldn't crash you out, but it might.
Have to ask: what's your drive space look like, hardware spec and all that.
Try exporting as a LOW resolution (picture size) with LOW quality values and see if it is something to do with your RAM (you might need more?)