"Attempt to index local 'char'(a nil value)" Error?

Whenever I test this script in Roblox Studio, it works fine. But when I open the client log in the developer console on the actual game, I get this error -

player.secretboy6.PlayerGui.LocalScript:3: attempt to index local 'char' (a nil value)

-and the script fails to work. How do I fix this?

local player = game.Players.LocalPlayer
local char = player.Character
local torso = char:WaitForChild("Torso")


Pos = Instance.new("Folder",script.Parent.Parent)
Pos.Name = "Position"

XPos = Instance.new("IntValue",Pos)
XPos.Name = "XPos"

YPos = Instance.new("IntValue",Pos)
YPos.Name = "YPos"

ZPos = Instance.new("IntValue",Pos)
ZPos.Name = "ZPos"

while 1==1 do
    X = torso.Position.X
    Y = torso.Position.Y
    Z = torso.Position.Z
    wait()
    XPos.Value = X
    YPos.Value = Y
    ZPos.Value = Z
end

a = nil
function Jay()
    local X = script.Parent.Parent.Position.XPos.Value
    local Y = script.Parent.Parent.Position.YPos.Value
    local Z = script.Parent.Parent.Position.ZPos.Value

    if a == nil or a == true then   
        if X >= -5 and X <= 5 then
            if Y >= 2 and Y<= 10 then
                if Z >= 190 and Z <= 202 then
                    for i=1, 0.5, -0.1 do
                        script.Parent.Parent.PlayerGui.ScreenGui.PressFTo.TextTransparency = i
                        wait()
                    end
                    a = false
                    script.Parent.ScreenGui.chatFrame.FirstConversation.Disabled = false
                end
            end
        end
    end

    if a == false then
        if not(X >= -5 and X <= 5) or not(Z >= 190 and Z <= 202) then
            for i=0.5, 1, 0.1 do
                script.Parent.Parent.PlayerGui.ScreenGui.PressFTo.TextTransparency = i
                wait()
            end
            a = true
            script.Parent.ScreenGui.chatFrame.FirstConversation.Disabled = true
        end
    end
    ---------------------------
end

XPos.Changed:connect(Jay)
YPos.Changed:connect(Jay)
ZPos.Changed:connect(Jay)