Script breaking after first execution (How to fix?) [SOLVED]

I've been working on this script for like a couple days until I got stuck on something I've been trying to fix it for 2 months and I haven't got a single clue what is causing the problem. I've even gotten some experienced scripters to help me with it but all 3 of them couldn't get it working

When I try this it works first try no problems but when I do it again nothing happens

(Not the full script but it's the main part that is breaking)

local function Shift(Bool)
    if Bool == true and IsShifting == false then
        IsShifting = true
        game.Lighting.GlobalShadows = false
        for _, child in pairs(Char:GetDescendants()) do
            if child:IsA("Part") then
                child.CustomPhysicalProperties = PhysicalProperties.new(0.05,0.3,0.5)
            end
        end
        Plr:GetMouse().Icon = "rbxasset://textures/Blank.png"
        game.Lighting.ShiftBlur.Enabled = true
        game.Lighting.ShiftDepthOfField.Enabled = true
        game.Lighting.ShiftColorCorrection.Enabled = true
        game.ReplicatedStorage.ServerShift:FireServer("EnterShift")
        workspace.Gravity = 1000
        workspace.CurrentCamera.FieldOfView = 57.5
        local ShiftPlate = Instance.new("Part")
        ShiftPlate.Name = "ShiftPlate"
        ShiftPlate.Anchored = true
        ShiftPlate.Transparency = 1
        ShiftPlate.Size = Vector3.new(2048,2048,2048)
        ShiftPlate.Parent = workspace
        local AllSeeingEye = script.AllSeeingEye:Clone()
        AllSeeingEye.Parent = workspace
        local Weld = Instance.new("Weld")
        Weld.Parent = AllSeeingEye
        Weld.Part0 = AllSeeingEye
        Weld.Part1 = Char:FindFirstChild("HumanoidRootPart")
        Weld.C0 = CFrame.new(0,32.5,-15)
        script.Parent.AllSeeingEye.Visible = true
        script.Parent.AllSeeingEyeCursor.Visible = true
        Char:FindFirstChildOfClass("Humanoid").Changed:Connect(function()
            if Char:FindFirstChildOfClass("Humanoid").Sit == true or Char:FindFirstChildOfClass("Humanoid").Jump == true then
                Char:FindFirstChildOfClass("Humanoid").Sit = false
                Char:FindFirstChildOfClass("Humanoid").Jump = false
            end
        end)
        game:GetService("RunService").RenderStepped:Connect(function()
            if IsShifting == false then return end
            workspace.CurrentCamera.CameraType = "Scriptable"
            workspace.CurrentCamera.CFrame = AllSeeingEye.CFrame
            Weld.C0 = CFrame.new(0,32.5,-15)
            AllSeeingEye.Orientation = Vector3.new(-25,AllSeeingEye.Orientation.Y,AllSeeingEye.Orientation.Z)
            ShiftPlate.CFrame = CFrame.new(Char.HumanoidRootPart.CFrame.X,workspace.FallenPartsDestroyHeight-1024,Char.HumanoidRootPart.CFrame.Z)
            game:GetService("UserInputService").MouseBehavior = Enum.MouseBehavior.LockCenter
            for i,v in pairs(game.Players:GetPlayers()) do
                local ray = Ray.new(Plr:GetMouse().Hit.Position, v.Character.HumanoidRootPart.Position - Plr:GetMouse().Hit.Position)
                local part,position = game.Workspace:FindPartOnRayWithWhitelist(ray, {v.Character.HumanoidRootPart})
                local magnitude = (Plr:GetMouse().Hit.Position - position).Magnitude
                if magnitude < 15 and game.Players:FindFirstChild(v.Name) and game.Players:FindFirstChild(v.Name).Character and game.Players:FindFirstChild(v.Name).UserId ~= 90841678 and not game.Players:FindFirstChild(v.Name):FindFirstChild("IsShifter") then
                    for _, child in pairs(v.Character:GetDescendants()) do
                        if child:IsA("Part") then
                            script.Parent.Info.Visible = true
                            script.Parent.Info.PlrName.TextBox.Text = "Name: "..game.Players[v.Name].Name
                            script.Parent.Info.PlrSpeed.TextBox.Text = "Speed: "..game.Players[v.Name].Character:FindFirstChildOfClass("Humanoid").WalkSpeed
                            script.Parent.Info.PlrJump.TextBox.Text = "Jump Power: "..game.Players[v.Name].Character:FindFirstChildOfClass("Humanoid").JumpPower
                            if game.Players[v.Name].Character:FindFirstChildOfClass("Humanoid").Health < math.huge then
                                script.Parent.Info.PlrHealth.TextBox.Text = "Health: "..game.Players[v.Name].Character:FindFirstChildOfClass("Humanoid").Health
                            else
                                script.Parent.Info.PlrHealth.TextBox.Text = "Health: ?"
                            end
                            game.Players[v.Name].Character.Archivable = true
                            if not script.Parent.Info.ViewportFrame:FindFirstChild(game.Players[v.Name].Character.Name) then
                                local PlrClone = game.Players[v.Name].Character:Clone()
                                PlrClone.HumanoidRootPart.Anchored = true
                                PlrClone.Parent = script.Parent.Info.ViewportFrame
                                PlrClone:SetPrimaryPartCFrame(CFrame.new(0,100000.5,0))
                            end
                            child.Material = Enum.Material.ForceField
                            IsHoveringOverPlr = true
                            PlrName = v.Name
                            game.Players[PlrName].Character.Archivable = false
                            if not game.Players[PlrName].Character.HumanoidRootPart:FindFirstChildOfClass("PointLight") then
                                local PointLight = Instance.new("PointLight")
                                PointLight.Name = "ShiftLight"
                                PointLight.Brightness = 2.125
                                PointLight.Range = 8
                                PointLight.Parent = game.Players[PlrName].Character.HumanoidRootPart
                            end
                        end
                    end
                else
                    IsHoveringOverPlr = false
                    PlrName = nil
                    script.Parent.Info.Visible = false
                    script.Parent.Info.PlrName.TextBox.Text = "Name:"
                    script.Parent.Info.PlrSpeed.TextBox.Text = "Speed:"
                    script.Parent.Info.PlrJump.TextBox.Text = "Jump Power:"
                    script.Parent.Info.PlrHealth.TextBox.Text = "Health:"
                    if script.Parent.Info.ViewportFrame:FindFirstChildOfClass("Model") then
                        script.Parent.Info.ViewportFrame:FindFirstChildOfClass("Model"):Destroy()
                    end
                    PlasticAll()
                    end
                end
        end)
        Flash()
    else
        IsShifting = false
        workspace:FindFirstChild("ShiftPlate"):Destroy()
        game.Lighting.GlobalShadows = true
        game.Lighting.ShiftBlur.Enabled = false
        game.Lighting.ShiftDepthOfField.Enabled = false
        game.Lighting.ShiftColorCorrection.Enabled = false
        workspace.Gravity = Gravity
        workspace.CurrentCamera.CameraType = "Custom"
        workspace.CurrentCamera.CFrame = game.Players.LocalPlayer.Character.HumanoidRootPart.CFrame
        workspace.CurrentCamera.FieldOfView = 70
        AllSeeingEyeCursor.Visible = false
        AllSeeingEye1.Visible = false
        script.Parent.Info.Visible = false
        IsHoveringOverPlr = false
        PlrName = nil
        script.Parent.Info.Visible = false
        script.Parent.Info.PlrName.TextBox.Text = "Name:"
        script.Parent.Info.PlrSpeed.TextBox.Text = "Speed:"
        script.Parent.Info.PlrJump.TextBox.Text = "Jump Power:"
        script.Parent.Info.PlrHealth.TextBox.Text = "Health:"
        if script.Parent.Info.ViewportFrame:FindFirstChildOfClass("Model") then
            script.Parent.Info.ViewportFrame:FindFirstChildOfClass("Model"):Destroy()
        end
        PlasticAll()
    end
end