This is first started on the 10th day of winter when I went to upgrade my pickaxe to copper. After that I went to sleep and it crashed. Did the day again and same thing happened. I checked online and saw there was a problem with winter previously so I went through winter and in Spring it's still crashing when I go to sleep after trying to upgrade my tools. I previously was able to upgrade my axe and watering can but now Im stuck with basic tools until the end of the game. MOD EDIT: Going to direct players over to this thread which is reporting the same issue. Thanks!