Serializer::decode(): Argument #1 ($data) must be of type string, null given

[miranyx]

Hey there, I am running the docker container and in the past also bare metal of addy.io, I always have the issue that with passkey 2FA, I have to do it twice since I get the following error:

 Symfony\Component\Serializer\Serializer::decode(): Argument anonaddy/anonaddy#1 ($data) must be of type string, null given, called in /var/www/anonaddy/vendor/symfony/serializer/Serializer.php on line 143 

I am using vaultwarden (also selfhosted), with the offical Bitwarden Firefox extension. On the second try it always logs me in.