Merge pull request #5343 from nextcloud/share-filter-missing-groups

filter missing groups in share provider

lib/private/Group/Manager.php

@@ -74,7 +74,7 @@ class Manager extends PublicEmitter implements IGroupManager {
 	private $cachedGroups = array();
 
 	/**
-	 * @var \OC\Group\Group[]
+	 * @var \OC\Group\Group[][]
 	 */
 	private $cachedUserGroups = array();
 

lib/private/Share20/DefaultShareProvider.php

@@ -743,6 +743,8 @@ class DefaultShareProvider implements IShareProvider {
 					$qb->andWhere($qb->expr()->eq('file_source', $qb->createNamedParameter($node->getId())));
 				}
 
+
+				$groups = array_filter($groups, function($group) { return $group instanceof IGroup; });
 				$groups = array_map(function(IGroup $group) { return $group->getGID(); }, $groups);
 
 				$qb->andWhere($qb->expr()->eq('share_type', $qb->createNamedParameter(\OCP\Share::SHARE_TYPE_GROUP)))