diff --git a/lib/private/Authentication/Listeners/UserLoggedInListener.php b/lib/private/Authentication/Listeners/UserLoggedInListener.php
index 711a759fad40b..15d3449427676 100644
--- a/lib/private/Authentication/Listeners/UserLoggedInListener.php
+++ b/lib/private/Authentication/Listeners/UserLoggedInListener.php
@@ -49,6 +49,11 @@ public function handle(Event $event): void {
 			return;
 		}
 
+		// prevent setting an empty pw as result of pw-less-login
+		if ($event->getPassword() === '') {
+			return;
+		}
+
 		// If this is already a token login there is nothing to do
 		if ($event->isTokenLogin()) {
 			return;
diff --git a/lib/private/Authentication/Token/PublicKeyTokenProvider.php b/lib/private/Authentication/Token/PublicKeyTokenProvider.php
index a293d2a840424..4657a8027679c 100644
--- a/lib/private/Authentication/Token/PublicKeyTokenProvider.php
+++ b/lib/private/Authentication/Token/PublicKeyTokenProvider.php
@@ -414,6 +414,11 @@ public function markPasswordInvalid(IToken $token, string $tokenId) {
 	public function updatePasswords(string $uid, string $password) {
 		$this->cache->clear();
 
+		// prevent setting an empty pw as result of pw-less-login
+		if ($password === '') {
+			return;
+		}
+
 		// Update the password for all tokens
 		$tokens = $this->mapper->getTokenByUser($uid);
 		foreach ($tokens as $t) {