generate unique id

Signed-off-by: Maxence Lange <maxence@artificial-owl.com>

Author: ArtificialOwl

lib/Service/DavService.php

@@ -422,6 +422,7 @@ private function manageNewCircles(DavCard $davCard, array $fromCard, array $curr
 				$this->configService->contactsBackendType(), $group . ' - ' . $user->getDisplayName()
 			);
 			$circle->setAltName($group);
+			$circle->generateUniqueId();
 			$circle->setContactAddressBook($davCard->getAddressBookId());
 			$circle->setContactGroupName($group);