The game crashes when you attempt to move an open lunch box while the GUI is open. A safeguard against this, such as whatever TE uses for its sachels, would make the issue nonexistent.

Should be fixed in 1.3.12

This seems to be a regression in The Spice of Life for recent versions of MC (works fine in MC 1.10.2 and earlier). Will look more into it, thanks for reporting.