Why does my timer error when I try to switch to another timer?

local Time = game.Workspace.Intermission.Value
local Game = game.Workspace.Game.Value

while true do
wait(1)
script.Parent.Text = Time
Time = Time - 1

if Time == -1 then
        script.Parent.Text = Time == false
    if Time == false then
        wait(1)
        script.Parent.Text = Game
        Game = Game - 1
    end 
    end
end

Time = the Intermission Time "15"

Game = the Game Time "60"

The error says: Players.NiceDerpling.PlayerGui.ScreenGui.TextBox.Script:10: bad argument #3 (string expected, got boolean)