local list = minetest.env:get_objects_in_radius(pos, 20);
local count = #list;
local MAX_ENTS = 15;

if (count > MAX_ENTS) then
    for i = (MAX_ENTS + 1), count do
        list[i]:remove();
    end
end

check list[i]:get_name() ~= "peaceful_npc:npc"