TypeError: helper_plugin_avatar::renderXhtml(): Argument #2 ($title) must be of type string, null given, called in /data/web/1/000/033/292/103133/htdocs/ssl/farmer/lib/plugins/avatar/syntax.php on line 67

An unforeseen error has occured. This is most likely a bug somewhere. It might be a problem in the avatar plugin.

More info has been written to the DokuWiki error log.