The save files were deleted after exiting the game? Or did you not save until that point? I'll go check on the error you reported, but it's most likely a movement path that couldn't be completed. For some reason, the default option isn't to skip movement when it's blocked, so instead it just soft locks the game. I always turn the skip movement option on, but this one must have slipped by. If it makes you feel any better, there probably wouldn't have been a way to save in that state. No idea why RPG Maker codes it that way to be honest. Glad you were enjoying the game though.
Edit: Found the bug, should be fixed with patch 0.35.11 now. Sorry about that again.