Undefined Index

I’m receiving this message:
PHP Notice: Undefined index: slider in E:\Home\aconteceeventos\Web\congressoabpte\wp-content\themes\Interstellar\includes\featured.php on line 6

<?php
global $options;
?>
	<?php
	//	Homepage Slideshow
	if ( '' <> $options['slider'] && isset($options['slider_enabled']) ) {

		// Get Slides
		$slides = array();
		foreach ($options['slider']['title'] as $k => $v) {
			$slides[] = array(
				'title' => $v,
				'link' => $options['slider']['link'][$k],
				'caption' => $options['slider']['caption'][$k],
				'image' => $options['slider']['image'][$k]
			);
		} ?>

Does anyone knows how to fix it?
Thank you very much!