Space in username of ldap object leads to a problem

[gituser317]

LDAP integration throws error messages on all of our users:

Could not create LDAP user (...). Error: [
'username' => [
0 => 'username has invalid characters'
]
]

The username attribut in ldap config is set to sAMAccountName. Our sAMAccountName in Active Directory is 'Firstname Lastname' so i think the problem is the space between them. This wasn't a problem in earlier versions of humhub.

Ubuntu 22.04.
PHP 8.1.2
Humhub 1.15.3