Insert ฐานข้อมูลแล้วขึ้น Duplicate entry for key ID

	$strSQL ="INSERT INTO  farmer_tb (farm_name,farmer_name,farmer_tel,farmer_email,farmer_password,create_date) 
											VALUES
											('".trim($_POST['farm_name'])."',
											'".trim($_POST['farmer_name'])."',
											'".trim($_POST['farmer_tel'])."',
											'".trim($_POST['farmer_email'])."',
											'".trim($_POST['farmer_password'])."',
											'".trim(date("Y-m-d H:i:s"))."')";
											$objQuery  = mysql_query($strSQL)or die(mysql_error());