Script Only Errors Out When Function Is Called A Certain Way?

Basically, I am trying to make a script builder with output, but I am having some troubles.

Currently, I am trying to get the value of the Owner value when the script errors, but it does not work.

-- Get the player name
local s = game.Workspace
local scripts = "Builder, Functions, Initialize, Random Junk"

function output(text, recipient, type)
    -- Output the text to the person with coloring that goes with the message
    local r = game.Players[recipient].PlayerGui["Output Gui"].Current_Labels.Value

    if type == "script_error" then
        -- Initial checks
        if r == 1 then
            pos = game.Players[recipient].PlayerGui["Output Gui"].TheWholeShabang.SOutput["Output" .. r].Position.Y.Offset
        else
            pos = game.Players[recipient].PlayerGui["Output Gui"].TheWholeShabang.SOutput["Output" .. game.Players[recipient].PlayerGui["Output Gui"].Current_Labels.Value].Position.Y.Offset
        end

        local label = Instance.new("TextLabel", game.Players[recipient].PlayerGui["Output Gui"].TheWholeShabang.SOutput)
        label.Name = "Output" .. r + 1
        label.BackgroundTransparency = 1
        label.Size = UDim2.new(0,355, 0,50)
        label.Font = Enum.Font.Arial
        label.FontSize = Enum.FontSize.Size14
        label.TextColor = BrickColor.new(255, 0, 0)
        label.TextWrapped = true
        label.TextXAlignment = Enum.TextXAlignment.Left
        label.TextYAlignment = Enum.TextYAlignment.Top

        -- Detect how many elements are in the Output Gui before positioning
        if r == 1 then
            label.Position = UDim2.new(0,0, 0, pos + 45)
        else
            label.Position = UDim2.new(0,0, 0, pos + 15)
        end

        -- Set the Instanced label(s) text
        label.Text = text

        game.Players[recipient].PlayerGui["Output Gui"].Current_Labels.Value = game.Players[recipient].PlayerGui["Output Gui"].Current_Labels.Value + 1
    end
end

local output_error = coroutine.create(function(source, message, trace)

end)

game:GetService("ScriptContext").Error:connect(function(message, trace, source)
    output("Error: " .. message .. " Trace: " .. trace .. ".", source["Owner"].Value, "script_error")
    if string.gmatch(scripts, source.Name) then
        print("We don't debug that script!")
    else

    end
end)

Is there a better way to output errors from a user created script in a script builder to the player? I need to output the error only to the player, not the whole server. If there is a better way other than setting a string value please share below.