The tool worked fine until a few days ago, when it began to show the following lua error:

[Advanced Bone Tool] lua/weapons/gmod_tool/stools/adv_bone.lua:36: attempt to index field 'combo_bonelist' (a nil value)
1. UpdateAdvBoneMenu - lua/weapons/gmod_tool/stools/adv_bone.lua:36
2. func - lua/weapons/gmod_tool/stools/adv_bone.lua:65
3. unknown - lua/includes/extensions/net.lua:38

A previous discussion refers to a similar problem, but it was marked as fixed. I'd guess it's having troubles with other addons, but i have no idea which ones could it be

Edit: The error stopped once i removed the tool from a custom category from this addon:
https://steamcommunity.com/sharedfiles/filedetails/?id=2950719460&searchtext=tool+categories