Dank Storage 5, Minecraft 1.20.1
Forge 47.2.16

Found in modpack All The Mods 9 version 0.2.33

Locking an empty slot in a dank storage causes a client crash to desktop due to a null pointer error. Please add a null check before locking slots.

This is the exact error received:
'The game crashed whilst keypressed event handler
Error: java.lang.NullPointerException: Cannot invoke "Object.getClass()" because "slot" is null'

Duplicate of #227