diff --git a/apps/files_external/lib/Service/DBConfigService.php b/apps/files_external/lib/Service/DBConfigService.php
index fd482ecbef7..f20d22254f6 100644
--- a/apps/files_external/lib/Service/DBConfigService.php
+++ b/apps/files_external/lib/Service/DBConfigService.php
@@ -121,6 +121,9 @@ class DBConfigService {
 	public function getMountsForUserAndPath(string $userId, array $groupIds, string $path, bool $forChildren): array {
 		$path = str_replace('/' . $userId . '/files', '', $path);
 		$path = rtrim($path, '/');
+		if ($path === '') {
+			$path = '/';
+		}
 		$builder = $this->getSelectQueryBuilder();
 		$builder->where($builder->expr()->orX(
 			$builder->expr()->andX( // global mounts