Adding page to favourites error

Whenever I want to add a page to my favourites, I get the following error:

~joris contains invalid characters ( , !, #, &, (, ), *, ,, ., :, ;, <, >, ?, @, [, ], ^).,vandermeersch:favourite contains invalid characters ( , !, #, &, (, ), *, ,, ., :, ;, <, >, ?, @, [, ], ^).

We recently moved our user management from JIRA to Crowd, where part of the user database (including my account) got put in an LDAP server that Crowd links to, but this error does not seem to be related to that change... or is it?