Cannot access the wiki at all because of username

MediaWiki internal error.

Original exception: exception 'MWException' with message 'SkinTemplate::makeTalkUrlDetails given invalid pagename User:[W]arriant' in /web/reactos.org/htdocs/wiki/includes/SkinTemplate.php:619
Stack trace:
#0 /web/reactos.org/htdocs/wiki/includes/SkinTemplate.php(619): SkinTemplate::makeTalkUrlDetails()
#1 /web/reactos.org/htdocs/wiki/includes/SkinTemplate.php(497): SkinRosCMS->makeTalkUrlDetails()
#2 /web/reactos.org/htdocs/wiki/includes/SkinTemplate.php(434): SkinRosCMS->buildPersonalUrls()
#3 /web/reactos.org/htdocs/wiki/includes/OutputPage.php(821): SkinRosCMS->outputPage()
#4 /web/reactos.org/htdocs/wiki/includes/Wiki.php(337): OutputPage->output()
#5 /web/reactos.org/htdocs/wiki/index.php(94): MediaWiki->finalCleanup()
#6

{main}

Exception caught inside exception handler: exception 'MWException' with message 'SkinTemplate::makeTalkUrlDetails given invalid pagename User:[W]arriant' in /web/reactos.org/htdocs/wiki/includes/SkinTemplate.php:619
Stack trace:
#0 /web/reactos.org/htdocs/wiki/includes/SkinTemplate.php(619): SkinTemplate::makeTalkUrlDetails()
#1 /web/reactos.org/htdocs/wiki/includes/SkinTemplate.php(497): SkinRosCMS->makeTalkUrlDetails()
#2 /web/reactos.org/htdocs/wiki/includes/SkinTemplate.php(434): SkinRosCMS->buildPersonalUrls()
#3 /web/reactos.org/htdocs/wiki/includes/OutputPage.php(821): SkinRosCMS->outputPage()
#4 /web/reactos.org/htdocs/wiki/includes/Exception.php(150): OutputPage->output()
#5 /web/reactos.org/htdocs/wiki/includes/Exception.php(174): MWException->reportHTML()
#6 /web/reactos.org/htdocs/wiki/includes/Exception.php(260): MWException->report()
#7 /web/reactos.org/htdocs/wiki/includes/Exception.php(294): wfReportException()
#8 [internal function]: wfExceptionHandler()
#9 {main}