Unfortunately we can't directly diagnose errors in the game's Update method (see proposed game change to fix that). Here are some things to try: Update to the latest version of SMAPI. Remove all your SMAPI mods temporarily; does it still happen? If not, reinstall your mods one at a time until it starts happening again. If it still happens with no SMAPI mods installed, try resetting your content files. Let me know what the results are and I'll help you from there. Can you try it again, then post your SMAPI-crash.txt file instead?