🐛 | Group | Drupal\group\Plugin\Group\RelationHandlerDefault::getRelationshipLabel() doesn't account for inexistent entity
Made a patch with #2 proposal; just fixed a missing ")".
Tested on my own envirotment (Under Drupal 10.2.6 with Group 2.2.2) in wich I had this problem.
The "call of label() on Null" problem after deleting content is now gone.