public function silent_warning( $errno, $errstr, $errfile, $errline ) {
		$this->add( 'notice', 'notice_' . $errno . '-' . $errline, array(
			'description' => '<strong>' . __( 'Warning' ) . '</strong>: ' . $errstr . '<br>on ' . $errfile . ' line ' . $errline,
			'state'       => 'warning',
		) );
	}