Hello, I found a bug in the sidebar_online_users.
Here is the original code :
class="username{xen:if '!{$user.visible}', ' invisible'}{xen:if {$user.followed}, ' followed'}">{$user.username}</a><xen:if is="{$i} < {$onlineUsers.limit}">,</xen:if>
After replacing with this code: (Code from...