ติดปัญหา Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource

<?
	session_start();
	include "config2.php";
	// ติดต่อกับฐานข้อมูล
	$connection = mysql_connect($dbHost,$dbUser,$dbPass) or die ("Can't Connect database");
	$db = mysql_select_db($dbName) or die ("Can't connect database");
	mysql_query("SET NAMES 'UTF8'");
	$strSQL = "SELECT * FROM match WHERE User = '".trim($_POST['User'])."' and Pass = '".trim($_POST['Pass'])."'";
	$objQuery = mysql_query($strSQL);
	$objResult = mysql_fetch_array($objQuery);
	if(!$objResult)
	{
			echo "<p align=\"center\">Username Incorrect!</p>";
	}
	else
	{
			$_SESSION["User"] = $objResult["User"];
			$_SESSION["Status"] = $objResult["Status"];

			session_write_close();
			
			if($objResult["Status"] == "ADMIN")
			{
				header("location:edit_match.php");
			}
			else
			{
				header("location:index.php");
			}
	}
	mysql_close();
?>