Many warning when I create Event

When I create on event hourly I hava many warnings : (link with BEE project)

Warning: Undefined array key 1 in Drupal\bat_event\Entity\Form\EventForm->validateForm() (line 253 of modules/contrib/bat/modules/bat_event/src/Entity/Form/EventForm.php).

Warning: foreach() argument must be of type array|object, null given in Drupal\bat_event\Entity\Form\EventForm->validateForm() (line 254 of modules/contrib/bat/modules/bat_event/src/Entity/Form/EventForm.php).

Warning: Undefined array key 1 in Drupal\bat_roomify\Store\Store->itemizeSplitHour() (line 85 of modules/contrib/bat/modules/bat_roomify/src/Store/Store.php).