Trying to get property of non-object

I am having trouble with the plugin when I activate and set it up. The following text pops up above my slider section, also causing other large sections of blank space on various pages.

“Notice: Trying to get property of non-object in /home/theraved/public_html/wp-includes/class-wp-query.php on line 3760

Notice: Trying to get property of non-object in /home/theraved/public_html/wp-includes/class-wp-query.php on line 3762

Notice: Trying to get property of non-object in /home/theraved/public_html/wp-includes/class-wp-query.php on line 3764

Notice: Trying to get property of non-object in /home/theraved/public_html/wp-includes/class-wp-query.php on line 3760

Notice: Trying to get property of non-object in /home/theraved/public_html/wp-includes/class-wp-query.php on line 3762

Notice: Trying to get property of non-object in /home/theraved/public_html/wp-includes/class-wp-query.php on line 3764”

Here is the referenced code in the .php file

	public function is_page( $page = '' ) {
		if ( !$this->is_page )
			return false;

		if ( empty( $page ) )
			return true;

		$page_obj = $this->get_queried_object();

		$page = array_map( 'strval', (array) $page );

		if ( in_array( (string) $page_obj->ID, $page ) ) {
			return true;
		} elseif ( in_array( $page_obj->post_title, $page ) ) {
			return true;
		} elseif ( in_array( $page_obj->post_name, $page ) ) {
			return true;
		} else {
			foreach ( $page as $pagepath ) {
				if ( ! strpos( $pagepath, '/' ) ) {
					continue;
				}
				$pagepath_obj = get_page_by_path( $pagepath );

				if ( $pagepath_obj && ( $pagepath_obj->ID == $page_obj->ID ) ) {
					return true;
				}
			}
		}

		return false;
	}

Any help will be appreciated.