diff --git a/apps/files_external/lib/AppInfo/Application.php b/apps/files_external/lib/AppInfo/Application.php
index 07a669fcd9..25f94b3b2e 100644
--- a/apps/files_external/lib/AppInfo/Application.php
+++ b/apps/files_external/lib/AppInfo/Application.php
@@ -63,6 +63,7 @@ use OCA\Files_External\Lib\Backend\DAV;
 use OCA\Files_External\Lib\Backend\FTP;
 use OCA\Files_External\Lib\Backend\Local;
 use OCP\Files\Config\IUserMountCache;
+use OCP\IGroup;
 use OCP\IUser;
 use Symfony\Component\EventDispatcher\GenericEvent;
 
@@ -110,6 +111,16 @@ class Application extends App implements IBackendProvider, IAuthMechanismProvide
 				$config->modifyMountsOnUserDelete($user->getUID());
 			}
 		);
+		$dispatcher->addListener(
+			IGroup::class . '::postDelete',
+			function (GenericEvent $event) {
+				/** @var IGroup $group */
+				$group = $event->getSubject();
+				/** @var DBConfigService $config */
+				$config = $this->getContainer()->query(DBConfigService::class);
+				$config->modifyMountsOnGroupDelete($group->getGID());
+			}
+		);
 	}
 
 	/**
diff --git a/apps/files_external/lib/Service/DBConfigService.php b/apps/files_external/lib/Service/DBConfigService.php
index 0d8d048fc1..9394924d39 100644
--- a/apps/files_external/lib/Service/DBConfigService.php
+++ b/apps/files_external/lib/Service/DBConfigService.php
@@ -114,15 +114,23 @@ class DBConfigService {
 		return $this->getMountsFromQuery($query);
 	}
 
-	public function modifyMountsOnUserDelete(string $uid) {
+	public function modifyMountsOnUserDelete(string $uid): void {
+		$this->modifyMountsOnDelete($uid, self::APPLICABLE_TYPE_USER);
+	}
+
+	public function modifyMountsOnGroupDelete(string $gid): void {
+		$this->modifyMountsOnDelete($gid, self::APPLICABLE_TYPE_GROUP);
+	}
+
+	protected function modifyMountsOnDelete(string $applicableId, int $applicableType): void {
 		$builder = $this->connection->getQueryBuilder();
 		$query = $builder->select(['a.mount_id', $builder->func()->count('a.mount_id', 'count')])
 			->from('external_applicable', 'a')
 			->rightJoin('a', 'external_applicable', 'b', $builder->expr()->eq('a.mount_id', 'b.mount_id'))
-			->where($builder->expr()->andX( // mounts for user
-					$builder->expr()->eq('a.type', $builder->createNamedParameter(self::APPLICABLE_TYPE_USER, IQueryBuilder::PARAM_INT)),
-					$builder->expr()->eq('a.value', $builder->createNamedParameter($uid))
-				)
+			->where($builder->expr()->andX(
+				$builder->expr()->eq('a.type', $builder->createNamedParameter($applicableType, IQueryBuilder::PARAM_INT)),
+				$builder->expr()->eq('a.value', $builder->createNamedParameter($applicableId))
+			)
 			)
 			->groupBy(['a.mount_id']);
 		$stmt = $query->execute();
@@ -131,7 +139,7 @@ class DBConfigService {
 
 		foreach ($result as $row) {
 			if((int)$row['count'] > 1) {
-				$this->removeApplicable($row['mount_id'], self::APPLICABLE_TYPE_USER, $uid);
+				$this->removeApplicable($row['mount_id'], $applicableType, $applicableId);
 			} else {
 				$this->removeMount($row['mount_id']);
 			}