VIP-System, klappt nicht

addEventHandler("onClientGUIClick", VIPBuyCarButton, function()
	local id = guiGridListGetItemText(VIPCarGridlist, guiGridListGetSelectedItem(VIPCarGridlist), 1);

	if id and tonumber(id) ~= -1 and tonumber(id) > 0 then
		local price = guiGridListGetItemText(VIPCarGridlist, guiGridListGetSelectedItem(VIPCarGridlist), 3);

		local coins = tonumber(getElementData(localPlayer, "m_coins"))

		if(coins >= tonumber(price))then
			triggerServerEvent("BuyCar", localPlayer, tonumber(id), tonumber(price));
		else
			outputChatBox("Du hast nicht genug Coins!", 125, 0, 0);
		end
	else
		outputChatBox("Wähle bitte ein Auto aus!", 125, 0, 0);
	end
end, false)	


function VIPPanel()
	if not guiGetVisible(VIPWindow) then

		guiGridListClear(VIPCarGridlist)

		showCursor(true)
		guiSetVisible(VIPWindow, true)

		local coins = getElementData(localPlayer, "m_coins")
		guiSetText(VIPCoinsLabel, "Deine Coins: "..coins);

		for _, data in pairs(VIPCars) do 
			local r = guiGridListAddRow(VIPCarGridlist);
			guiGridListSetItemText(VIPCarGridlist, r, VIPColumnID, data.carid, false, false)
			guiGridListSetItemText(VIPCarGridlist, r, VIPColumnName, getVehicleNameFromModel(data.carid), false, false)
			guiGridListSetItemText(VIPCarGridlist, r, VIPColumnPrice, data.carprice, false, false)
		end


	else
		showCursor(false)
		guiSetVisible(VIPWindow, false)
	end
end
addEvent("doOpenVipPanel", true)
addEventHandler("doOpenVipPanel", localPlayer, VIPPanel)

addEvent("BuyCar", true)
addEventHandler("BuyCar", root, function(id, price)
	local x, y, z = getElementPosition(client)
	carbuy ( client, price, id, x, y, z, 0, 0, 0, nil, nil, nil, nil, nil, nil, nil, true )
end)


addEventHandler("onPlayerQuit", root, function()
	if m_isPlayerVip(source) then
		MySQL_SetString("userdata", "coins", MySQL_Save ( MySQL_Save ( getElementData ( player, "m_coins" ))) , "Name LIKE '"..getPlayerName(source).."'")
	end
end)




function m_setPlayerVip(player)


	local result = mysql_query(handler, "SELECT * from userdata WHERE Name LIKE '"..getPlayerName(player).."'");

	if result then
		if mysql_num_rows(result) > 0 then
			local assoc = mysql_fetch_assoc(result);
			if tonumber(assoc["vip"]) == 1 then
				setElementData(player, "m_vip", true)
				setElementData(player, "m_coins", tonumber(assoc["coins"]))
			else
				setElementData(player, "m_vip", false)
				setElementData(player, "m_coins", 0)
			end	
			mysql_free_result(result);
		end
	end
end