Server crashes when being killed.
After rebooting the game and re-entering the world, server crashes again when trying to interact with the back pack placed on the ground.
btw, the placed backpack won't break if it's placed by death.
Note this is not a compatibility issue with gravestone mods, the bug still exists even without grave tone mods.
mod version: TravellersBackpack-1.12.2-0.1.3a
forge version: 14.23.5.2837
minecraft version: 1.12.2
crash log:
https://pastebin.com/8EshBMaA

Note, bug is still peasant in TravellersBackpack-1.12.2-0.1.4a after testing

new crash log here:
https://pastebin.com/NzpcVefg

Should be fixed in the upcoming release