Well hello. I just want to help you because when player disconnected on my server, this lua error went spamming.

[Intelligent HUD] lua/autorun/client/intelligent_hud_2d_window.lua:240: Tried to use a NULL entity!
1. __newindex - [C]:-1
2. SmoothRemove - lua/autorun/client/intelligent_hud_2d_window.lua:240
3. _InvalidParent - lua/autorun/client/intelligent_hud_handler.lua:753
4. Update - lua/autorun/client/intelligent_hud_2d_window.lua:333
5. Update - lua/autorun/client/intelligent_hud_cl/intelligent_hud_window_handler.lua:49
6. fn - lua/autorun/client/intelligent_hud_cl/intelligent_hud_window_handler.lua:55
7. unknown - addons/ulib/lua/ulib/shared/hook.lua:183

Can you please tell me what happened ? (I can't lua)
And I hope it will be fixed :)
Thank you :)