Buoy code broken

buoy = {}
function buoy:register_buoy(name, def)
    minetest.register_entity(name, {
        hp_max = def.hp_max,
        physical = true,
        collisionbox = def.collisionbox,
        visual = def.visual,
        visual_size = def.visual_size,
        mesh = def.mesh,
        textures = def.textures,
        drawtype = def.drawtype,
        on_rightclick = def.on_rightclick,
        type = def.type,
        sounds = def.sounds,
        animation = def.animation,

        set_animation = function(self, type)
            if not self.animation then
                return
            end
            if not self.animation.current then
                self.animation.current = ""
            end
            if type == "buoy" and self.animation.current ~= "buoy" then
                if
                    self.animation.buoy_start
                    and self.animation.buoy_end
                    and self.animation.speed_normal
                then
                    self.object:set_animation(
                        {x=self.animation.stand_start,y=self.animation.stand_end},
                        self.animation.speed_normal, 0
                    )
                    self.animation.current = "buoy"
                end
            end
        end,

    })
end

buoy:register_buoy({
    resource_name = "buoy:harbour_green",
    type = "npc",
    hp_max = 400000000,
    follow = "default:torch",
    collisionbox = {-0.4, -1, -0.4, 0.4, 0.8, 0.4},
    visual = "mesh",
    mesh = "buoy.x",
    textures = {"buoy_harbour_green.png"},
    visual_size = {x=1,y=1},
    armor = 80,
    drawtype = "front",
    animation = {
        speed_normal = 15,
        buoy_start = 0,
        buoy_end = 40,
    },
        on_rightclick = function(self, puncher, time_from_last_punch, tool_capabilities, dir)
        self.object:remove()
        if puncher and puncher:is_player() then
            puncher:get_inventory():add_item("main", "buoy:harbour_green")
        end
    end,
})

minetest.register_craftitem("buoy:harbour_green", {
    description = "Green Harbour Buoy",
    inventory_image = "buoy_harbour_green_inv.png",
    liquids_pointable = true,
        on_place = function(itemstack, placer, pointed_thing)
            if pointed_thing.type ~= "node" then
                return
            end
            pointed_thing.under.y = pointed_thing.under.y + 1
            minetest.env:add_entity(pointed_thing.under, "buoy:harbour_green")
            itemstack:take_item()
            return itemstack
        end,
})