Unfortunately receive the following error
[passive_footvision-master] addons/passive_footvision-master/lua/cl_passive_footvision.lua:18: attempt to index a nil value
1. fn - addons/passive_footvision-master/lua/cl_passive_footvision.lua:18
2. Run - addons/ulib/lua/ulib/shared/hook.lua:109
3. CheckForLegacyTabs - addons/ttt2-0.14.0b/lua/terrortown/menus/gamemode/legacy.lua:86
4. Initialize - addons/ttt2-0.14.0b/lua/terrortown/menus/gamemode/legacy.lua:105
5. PostInherit - addons/ttt2-0.14.0b/gamemodes/terrortown/gamemode/client/cl_help.lua:105
6. BuildFromFolder - addons/ttt2-0.14.0b/lua/ttt2/libraries/classbuilder.lua:123
7. unknown - addons/ttt2-0.14.0b/gamemodes/terrortown/gamemode/client/cl_help.lua:108