tyrann0us on "[Plugin: RSVP and Event Management Plugin] PHP warnings on frontend"

Hi, I'm getting the following error messages on the page with the [rsvp] shortcode when a guest is editing the details:

Notice: Undefined index: mainKidsMeal in /var/www/vhosts/example.com/httpdocs/wp-content/plugins/rsvp/rsvp_frontend.inc.php on line 221
Notice: Undefined index: mainKidsMeal in /var/www/vhosts/example.com/httpdocs/wp-content/plugins/rsvp/rsvp_frontend.inc.php on line 222
Notice: Undefined index: mainVeggieMeal in /var/www/vhosts/example.com/httpdocs/wp-content/plugins/rsvp/rsvp_frontend.inc.php on line 230
Notice: Undefined index: mainVeggieMeal in /var/www/vhosts/example.com/httpdocs/wp-content/plugins/rsvp/rsvp_frontend.inc.php on line 232

Is it possible to fix this errors? Thanks!

https://wordpress.org/plugins/rsvp/