Describe the bug
It is possible to put items other than upgrades in upgrade slots, by swapping an item with an upgrade in the slot. It causes the game to crash every time that backpack is opened.

crash-2021-08-05_16.13.48-client.txt

None other mods were used.

To Reproduce
Steps to reproduce the behavior:

1. Open backpack
2. Put an upgrade in the upgrade slot
3. Take any other item, and swap the two
4. The game crashes

Screenshots

Versions
sophisticatedbackpacks-1.16.4-2.2.7.222
1.16.5-forge-36.2.0

Please dont open issues for bugs that were fixed long time ago. Just update the mod to newer version

Please dont open issues for bugs that were fixed long time ago. Just update the mod to newer version

I am sorry, I didn't realize it actually is an old version.