XF 1.5 Grabbing username code not working (was working before)

[D3monw3st12345]

Hello, i'm looking to grab the users username if logged in. Here's the css code I have which worked before, but now doesn't seem to be working.

                <xen:if is="{$visitor.user_id}">
                    <span class="loginSuccess">
                        WELCOME {xen:phrase username, 'x={$visitor.username}'}!
                    </span>
                </xen:if>

Here's what it looks like: https://gyazo.com/592c1007ae10d47920464db018dd083c