diff --git a/.luacheckrc b/.luacheckrc
index 9fb6a7c..e6fec97 100644
--- a/.luacheckrc
+++ b/.luacheckrc
@@ -14,6 +14,7 @@ read_globals = {
 	"ItemStack", "datastorage",
 
 	"hb",
+	"doors",
 }
 
 files["callbacks.lua"].ignore = { "player", "draw_lite_mode" }
diff --git a/default-categories.lua b/default-categories.lua
index 5c60c6d..b4082d0 100644
--- a/default-categories.lua
+++ b/default-categories.lua
@@ -77,8 +77,11 @@ if unified_inventory.automatic_categorization then
 					unified_inventory.add_category_item('environment', name)
 				elseif def.light_source and def.light_source > 0 then
 					unified_inventory.add_category_item('lighting', name)
-				elseif doors and doors.registered_doors and doors.registered_doors[name..'_a'] or
-				       doors and doors.registered_trapdoors and doors.registered_trapdoors[name] then
+				elseif group.door or
+					   minetest.global_exists("doors") and (
+					     doors.registered_doors and doors.registered_doors[name..'_a'] or
+					     doors.registered_trapdoors and doors.registered_trapdoors[name] then
+					   )
 					unified_inventory.add_category_item('building', name)
 				end
 			end