[ERROR] gamemodes/underdone/gamemode/core/clientfiles/menus/cl_mapobject_editor.lua:100: attempt to get length of field 'CurrentObjectSet' (a nil value)
  1. DoClick - gamemodes/underdone/gamemode/core/clientfiles/menus/cl_mapobject_editor.lua:100
   2. OnMouseReleased - lua/vgui/dlabel.lua:218
    3. unknown - lua/vgui/dimagebutton.lua:129