Wiki says breaking a tent block while holding an empty tent bag would pack up the tent. So I did. Me and my friends crashed as soon as the block breaked. They can join back, the tent is gone. I however cannot login again in our server, because doing so will cause an immediate crash to me and them each time (corrupt item in my inventory as I packed up?).

Gist with my crash report:
https://gist.github.com/CapoFantasma97/2c212fbc09446216d60f22320245e45e