Disabling Event Tickets generates error – version 1.6.10

There seems to be a bug in file: tickets.php line 21

it is:
if ( ! $display_options[‘price_tickets_info’] )

should likely be:
if ( ! isset( $display_options[‘price_tickets_info’] ) || ! $display_options[‘price_tickets_info’] )

when I changed it error disappeared.

I am kind of new to wordpress/plugins is there a place I could contribute fixes if needed? how?

https://www.ads-software.com/plugins/events-maker/