diff --git a/lib/FilesHooks.php b/lib/FilesHooks.php
index e401f9fde..90a93773d 100644
--- a/lib/FilesHooks.php
+++ b/lib/FilesHooks.php
@@ -1047,7 +1047,9 @@ protected function fixPathsForShareExceptions(array $affectedUsers, $shareId) {
 		$query = $queryBuilder->executeQuery();
 
 		while ($row = $query->fetch()) {
-			$affectedUsers[$row['share_with']] = $row['file_target'];
+			if ($row['share_with'] !== null) {
+				$affectedUsers[$row['share_with']] = $row['file_target'];
+			}
 		}
 
 		return $affectedUsers;