помогите с луа ошибкой

[DarkRP] gamemodes/darkrp/gamemode/modules/doorsystem/sh_doors.lua:30: Tried to use a NULL entity! 1. GetClass - [C]:-1 2. isDoor - gamemodes/darkrp/gamemode/modules/doorsystem/sh_doors.lua:30 3. unknown - addons/rp_adv_keys/lua/weapons/weapon_adv_keys/cl_menu.lua:28 (x14)