attempt to concatenate nil with string?

I have recently made a map voting script but I get an error saying "attempt to concatenate nil with string". Here is where the error is:

if string.match(v.Name, "Votes") then
    print(mapName)
    v.SurfaceGui.TextLabel.Text = mapName.." - ".. votes
end

I assume it is from mapName because whenever it is printed it prints as nil, the mapName variable is a table. Here is where the table is inserted:

function module.MapVoting(dur)

    mapVotes = {}

    for i,v in pairs(game.Workspace.Lobby.Voting:GetChildren()) do
        table.insert(mapVotes, {order = tonumber(v.Name:match("%u+")); name = getMap(); players = {}})
        if v.Name:match("%u+") then
            print("s")
        end

Please help me I don't know how to fix this.