diff --git a/lib/private/Session/Internal.php b/lib/private/Session/Internal.php
index 285b6fd796037..400dc251cfd84 100644
--- a/lib/private/Session/Internal.php
+++ b/lib/private/Session/Internal.php
@@ -103,6 +103,7 @@ public function remove(string $key) {
 	public function clear() {
 		$this->invoke('session_unset');
 		$this->regenerateId();
+		$this->invoke('session_write_close');
 		$this->startSession(true);
 		$_SESSION = [];
 	}