script.on_event(defines.events.on_entity_damaged, function(event)
    local entity = event.entity

    -- Check if the damaged entity is a stone wall or a construction robot
    if entity and entity.valid and (entity.name == "stone-wall" or entity.name == "construction-robot") then
        -- Check if the damage would destroy the entity
        if event.final_health <= 0 then
            local surface = entity.surface
            local position = entity.position
            local force = entity.force
            local direction = entity.direction
            local name = entity.name

            -- Remove the original entity
            entity.destroy()

            -- Check if the force has researched ghost placement
            if force.technologies["construction-robotics"] and force.technologies["construction-robotics"].researched then

                -- Don't create a ghost for construction robots (not possible)
                if name == "construction-robot" then
                    return
                end

                -- Create a ghost of the entity
                surface.create_entity {
                    name = "entity-ghost",
                    inner_name = name,
                    position = position,
                    force = force,
                    direction = direction
                }
            end
        end
    end
end)