[libk] bad argument #3 to 'Add' (function expected, got nil)

[Zulbem]

`[libk] bad argument #3 to 'Add' (function expected, got nil)

1. Add - lua/includes/modules/hook.lua:31
2. unknown - addons/libk/lua/libk/server/sv_libk_database.lua:13
3. include - [C]:-1
4. unknown - addons/libk/lua/autorun/_libk_loader.lua:36
   [LibK] Loading SERVER file: sv_libk_model.lua
   `

Since I've started using mysql, this has appeared in my console and was wondering if you have any tips to what might be causing it?