private function upgrade_db_post_3484()
	{
		$new_plugins = array();
		$plugins = Options::get( 'active_plugins' );
		if( is_array($plugins) ) {
			foreach( $plugins as $filename ) {
				if(!file_exists($filename)) {
					// try adding base path to stored path
					$filename = HABARI_PATH . $filename;
				}
				if(file_exists($filename)) {
					require_once $filename;
					$class = Plugins::class_from_filename($filename);
					$short_file = substr( $filename, strlen( HABARI_PATH ) );
				}

				if( file_exists($filename) && $class ) {
					$new_plugins[$class] = $short_file;
				}
			}
		}
		Options::set('active_plugins', $new_plugins);
	}