HTTP requests breaking?

I'm using the twitch api to pull information about a channel. When I put in a valid channel it works, but after I put in a non-valid channel, it stops working. Any ideas why and how to fix it?

function handle(err)
errortext = 'ERROR: ' .. err:gsub("(.-:)","")
    return errortext
end

function pcallgetasync(person)
getasync = game:GetService('HttpService'):GetAsync('https://api.twitch.tv/kraken/channels/' .. person, true)
return getasync
end



game.Players.PlayerAdded:connect(function(player)
    player.PlayerGui:WaitForChild('ScreenGui').Frame.SearchBox.Search.Changed:connect(function()
        person = player.PlayerGui.ScreenGui.Frame.SearchBox.Text
        if player.PlayerGui:WaitForChild('ScreenGui').Frame.SearchBox.Search.Value == true then
            local httpservice = game:GetService('HttpService')
            player.PlayerGui.ScreenGui.Frame.SearchBox.Changed:connect(function()
                person = player.PlayerGui.ScreenGui.Frame.SearchBox.Text
            end)
            if pcall (function() pcallgetasync(person) end) then
                afollowers = string.find(getasync, '"followers":')
                endthing = string.find(getasync, ',"_links"')
                followers = string.sub(getasync, afollowers + 12, endthing - 1)
                player.PlayerGui.ScreenGui.Frame.Followers.Text = 'Followers: ' .. followers
                player.PlayerGui.ScreenGui.Frame.SearchBox.Search.Value = false
            else
                print(xpcall(pcallgetasync, handle))
                --errortext = tostring(xpcall(pcallgetasync, handle))
                a = require(game.Workspace.ErrorScript)
                a(player.Name, errortext)
            end
        end
    end)
end)