This happens to me after pressing the Q menu after the latest update:
[ERROR] gamemodes/combinecontrol/gamemode/cl_hud.lua:1240: Tried to use a NULL entity!
1. OBBMins - [C]:-1
2. DrawDoors - gamemodes/combinecontrol/gamemode/cl_hud.lua:1240
3. unknown - gamemodes/combinecontrol/gamemode/cl_hud.lua:1600
(It's spammed in console, it also disables the HUD)