What is going wrong what

    local g = def.vinegrow
    minetest.register_node("mindeca:plant_vine_"..name..g, {
        description = def.growdesc.." "..g.."\n\nDoing some decoration?\n\nMindeca",
        drawtype = "plantlike",
        tiles = {
            "mindeca_item_vine_"..name..g..".png"
            },
        inventory_image = "mindeca_item_flower_"..name..g..".png",
        paramtype = "light",
        sunlight_propagates = true,
        walkable = false,
        is_ground_content = false,
        selection_box = {
            type = "fixed",
            fixed = {-3/16, -8/16, -3/16, 3/16, 4/16, 3/16}
        },
        groups = {dig_immediate = 3},
        sounds = default.node_sound_leaves_defaults(),

        on_construct = function(pos)
            if farmod then
                local til = minetest.get_node({x = pos.x, y = pos.y-1, z = pos.z})
                if minetest.get_item_group(til.name, "soil") < 3 then
                    minetest.get_node_timer(pos):start(math.random(5, 5))
                else
                    minetest.get_node_timer(pos):start(math.random(50, 50))
                end
            else
                minetest.get_node_timer(pos):start(math.random(50, 50))
            end
        on_timer = function(pos, elapsed)
            if not mindeca.can_grow_fullsun(pos) then
                minetest.get_node_timer(pos):start(math.random(5, 5))
            return
            elseif g == 1 then
                minetest.set_node(pos, {name = "mindeca:plant_vine_"..name})
            else
                g = math.min(g - 1, 20)
                minetest.set_node(pos, {name = "mindeca:plant_vine_"..name..g})
            end
        end
    })