Repeating event: no date/time input

Hi everybody!

Currently we are running v7.0.4 on WP 6.8.1. We had some recurring events, that are now repeating events, and we are fine with it. We activated the repeating events, but trying to create an event, we don’t see the date/time picker.
When saving the event as a draft, we only see the newest one in the overview. In the header it says we have 3 events in state “draft”, but only the first one is visible, and in the column where date/time should be show it shows an error message that there’s a critical error.
In the mail it says this:

Fehler-Details ==============

Ein Fehler vom Typ E_ERROR wurde in der Zeile 234 der Datei /home/webpages/lima-city/zukunftsaktiv/wp-zukunftsaktiv-de/wp-content/plugins/events-manager/classes/recurrences/recurrence-sets.php verursacht. Fehlermeldung: Uncaught Error: Call to a member function get_recurrence_description() on null in /home/webpages/lima-city/zukunftsaktiv/wp-zukunftsaktiv-de/wp-content/plugins/events-manager/classes/recurrences/recurrence-sets.php:234 

Stack trace: 

#0 /home/webpages/lima-city/zukunftsaktiv/wp-zukunftsaktiv-de/wp-content/plugins/events-manager/classes/em-event.php(3419): EM\Recurrences\Recurrence_Sets->get_recurrence_description() 

#1 /home/webpages/lima-city/zukunftsaktiv/wp-zukunftsaktiv-de/wp-content/plugins/events-manager/classes/em-event-posts-admin.php(430): EM_Event->get_recurrence_description()

 #2 /home/webpages/lima-city/zukunftsaktiv/wp-zukunftsaktiv-de/wp-includes/class-wp-hook.php(326): EM_Event_Recurring_Posts_Admin::columns_output('date-time')

 #3 /home/webpages/lima-city/zukunftsaktiv/wp-zukunftsaktiv-de/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters('', Array) 

#4 /home/webpages/lima-city/zukunftsaktiv/wp-zukunftsaktiv-de/wp-includes/plugin.php(517): WP_Hook->do_action(Array) 

#5 /home/webpages/lima-city/zukunftsaktiv/wp-zukunftsaktiv-de/wp-admin/includes/class-wp-posts-list-table.php(1410): do_action('manage_event-re...', 'date-time', 2802) 

#6 /home/webpages/lima-city/zukunftsaktiv/wp-zukunftsaktiv-de/wp-admin/includes/class-wp-list-table.php(1802): WP_Posts_List_Table->column_default(Object(WP_Post), 'date-time') 

#7 /home/webpages/lima-city/zukunftsaktiv/wp-zukunftsaktiv-de/wp-admin/includes/class-wp-posts-list-table.php(1444): WP_List_Table->single_row_columns(Object(WP_Post)) 

#8 /home/webpages/lima-city/zukunftsaktiv/wp-zukunftsaktiv-de/wp-admin/includes/class-wp-posts-list-table.php(839): WP_Posts_List_Table->single_row(Object(WP_Post), 0) 

#9 /home/webpages/lima-city/zukunftsaktiv/wp-zukunftsaktiv-de/wp-admin/includes/class-wp-posts-list-table.php(815): WP_Posts_List_Table->_display_rows(Array, 0) 

#10 /home/webpages/lima-city/zukunftsaktiv/wp-zukunftsaktiv-de/wp-admin/includes/class-wp-list-table.php(1712): WP_Posts_List_Table->display_rows() 

#11 /home/webpages/lima-city/zukunftsaktiv/wp-zukunftsaktiv-de/wp-admin/includes/class-wp-list-table.php(1639): WP_List_Table->display_rows_or_placeholder() 

#12 /home/webpages/lima-city/zukunftsaktiv/wp-zukunftsaktiv-de/wp-admin/edit.php(503): WP_List_Table->display() 

#13 {main} thrown`

Doesn’t seem to be a problem that we could fix on our own. Anybody has an idea?
TIA
Marcus