db_text throws an error, when set() is called with the current value

			$sql = 'UPDATE ' . $this->table . "

				SET config_value = '" . $this->db->sql_escape($value) . "'

				WHERE config_name = '" . $this->db->sql_escape($key) . "'";

			$result = $this->db->sql_query($sql);

			if (!$this->db->sql_affectedrows($result))

			{

				$sql = 'INSERT INTO ' . $this->table . ' ' . $this->db->sql_build_array('INSERT', array(

					'config_name'	=> $key,

					'config_value'	=> $value,

				));

				$this->db->sql_query($sql);

			}