Notice Error

Thanks for this plugin! I’m really enjoying it.

I did want to let you know that I’m receiving some Notice errors when in debug mode.

This error is displaying on a page that uses the shortcode [download category="4"]:
Notice: Undefined offset: 0 in .../wp-content/plugins/wp-downloadmanager/wp-downloadmanager.php on line 469

I’m also receiving the following errors on the main downloads page:
Notice: Undefined index: dl_cat in .../wp-content/plugins/wp-downloadmanager/wp-downloadmanager.php on line 505

Notice: Undefined index: dl_page in .../wp-content/plugins/wp-downloadmanager/wp-downloadmanager.php on line 506

Notice: Undefined index: dl_search in .../htdocs/wp-content/plugins/wp-downloadmanager/wp-downloadmanager.php on line 507

https://wordpress.org/plugins/wp-downloadmanager/