what's the cap doing exactly? is it a small or large eventsheet?
we need to narrow down the possible causes
post a cap file to make it easier, or if you don't want to upload your cap:
one way would be to save your cap
start deleting random chunks of it, and see when it stops crashing
when it stops crashing reload it, and start deleting smaller chunks of only the part that was causing the crash
once you have at least a general idea of where the problem is, paste a screenshot of that part of the cap
if you can delete the entire event sheet without fixing the crash, that means the problem is a certain construct object, or a corrupt capfile(less likely)
if it's an object, you should be able to start deleting objects and running it until you fix the crash, and then you know the object