Roblox not detecting v[2] as a number

[hollow yoke]

Hey, I made this script and it says that it's "expecting a number, but it's being given an "error type"". Can someone please help me?

return {
    getRandomIndex = function(chances)
        for i, v in ipairs(chances) do
            local randomNum = math.random(1, v[2])
            if randomNum == 1 and v[2] > chances[1][2] then
                return {
                    v[1];
                    v[2];
                    v[3];
                }
            end
        end
        
        return chances[1]
    end,
}