If your site is using revisions for menu item links (for example for use with workspaces), then you can get into a situation:
TypeError: array_diff_key(): Argument #1 ($array) must be of type array, false given in array_diff_key() (line 302 of core/lib/Drupal/Core/Entity/EntityStorageBase.php).
Drupal\Core\Entity\EntityStorageBase->loadMultiple() (Line: 77)
Drupal\group_content_menu\GroupContentMenuParentFormSelector->getMenuOptions() (Line: 58)
Drupal\group_content_menu\GroupContentMenuParentFormSelector->parentSelectElement() (Line: 104)
See patch
Active
3.0
Code
Special thanks got @s_leu for reporting this issue in slack.
Thanks for writing up the issue @heddn. I can confirm the changes are resolving the fatal errors, but I guess we should wait for others before marking it as RTBC.
Automatically closed - issue fixed for 2 weeks with no activity.