Fix

api.lua

@@ -149,8 +149,12 @@ function maidroid.register_maidroid(product_name, def)
     inventory_image = def.inventory_image,
     stack_max = 1,
     on_use = function(itemstack, user, pointed_thing)
+      print(pointed_thing.under, pointed_thing.above)
+      if pointed_thing.above ~= nil then
 	minetest.add_entity(pointed_thing.above, product_name)
 	return itemstack
       end
+      return nil
+    end
   })
 end