Sidebar disappeared (add filter)

Hi Tom,

I have used the following code from the page woorkup. Now my sidebar is gone, and I would like to undo this.

add_filter( 'wp_trim_excerpt', 'tu_excerpt_metabox_more' );
function tu_excerpt_metabox_more( $excerpt ) {
	$output = $excerpt;
        $settings = wp_parse_args( 
		get_option( 'generate_blog_settings', array() ), 
		generate_blog_get_defaults() 
	);
	
	if ( has_excerpt() ) {
		$output = sprintf( '%1$s <a href="%2$s">%3$s</a>',
			$excerpt,
			get_permalink(),
                        wp_kses_post( $settings['read_more'] )
		);
	}
	
	return $output;
}

Can you please help me.