diff --git a/apps/files_sharing/api/sharees.php b/apps/files_sharing/api/sharees.php
index d23a6f5650..c6bef8d784 100644
--- a/apps/files_sharing/api/sharees.php
+++ b/apps/files_sharing/api/sharees.php
@@ -271,7 +271,11 @@ class Sharees {
 		$foundRemoteById = false;
 		foreach ($addressBookContacts as $contact) {
 			if (isset($contact['CLOUD'])) {
-				foreach ($contact['CLOUD'] as $cloudId) {
+				$cloudIds = $contact['CLOUD'];
+				if (!is_array($cloudIds)) {
+					$cloudIds = [$cloudIds];
+				}
+				foreach ($cloudIds as $cloudId) {
 					if (strtolower($contact['FN']) === $search || strtolower($cloudId) === $search) {
 						if (strtolower($cloudId) === $search) {
 							$foundRemoteById = true;