Does table.insert require an index?

I've been making loot drops and I received the following error: Wrong number of arguments to 'insert'

ServerScript:

function getItem(ID)
    local items = game:GetService("ServerStorage").Items:GetDescendants()
    for i, v in pairs(items) do
        if v:FindFirstChild("ItemID") then
            if v.ItemID.Value == ID then
                return v
            end
        end
    end
end

function dropItems(mob)
    local loot = {}
    for i, v in pairs(mob.MobConfig.ItemsDropped:GetChildren()) do
        local probability = math.random(1, 100)
        if v.Value >= probability then
            table.insert(loot, getItem(v.Name))         --Error occurs here
        end
    end
    return loot
end

Is there something trivial that I messed up on? Does table.insert need an index? Any help would be appreciated.