MediaWiki internal error.

Original exception: [d6e498b25bea83aa2fa60697] /index.php?title=User:34.229.131.116 TypeError: number_format() expects parameter 1 to be float, null given
Backtrace:
from /var/www/html/skins/Citizen/includes/Partials/Tagline.php(100)
#0 /var/www/html/skins/Citizen/includes/Partials/Tagline.php(100): number_format(NULL, integer)
#1 /var/www/html/skins/Citizen/includes/Partials/Tagline.php(71): Citizen\Partials\Tagline->buildUserTagline(Title)
#2 /var/www/html/skins/Citizen/includes/SkinCitizen.php(118): Citizen\Partials\Tagline->getTagline(OutputPage)
#3 /var/www/html/includes/skins/SkinMustache.php(136): SkinCitizen->getTemplateData()
#4 /var/www/html/includes/skins/SkinTemplate.php(146): SkinMustache->generateHTML()
#5 /var/www/html/includes/OutputPage.php(2634): SkinTemplate->outputPage()
#6 /var/www/html/includes/MediaWiki.php(927): OutputPage->output(boolean)
#7 /var/www/html/includes/MediaWiki.php(940): MediaWiki::{closure}()
#8 /var/www/html/includes/MediaWiki.php(546): MediaWiki->main()
#9 /var/www/html/index.php(53): MediaWiki->run()
#10 /var/www/html/index.php(46): wfIndexMain()
#11 {main}

Exception caught inside exception handler: [d6e498b25bea83aa2fa60697] /index.php?title=User:34.229.131.116 TypeError: number_format() expects parameter 1 to be float, null given
Backtrace:
from /var/www/html/skins/Citizen/includes/Partials/Tagline.php(100)
#0 /var/www/html/skins/Citizen/includes/Partials/Tagline.php(100): number_format(NULL, integer)
#1 /var/www/html/skins/Citizen/includes/Partials/Tagline.php(71): Citizen\Partials\Tagline->buildUserTagline(Title)
#2 /var/www/html/skins/Citizen/includes/SkinCitizen.php(118): Citizen\Partials\Tagline->getTagline(OutputPage)
#3 /var/www/html/includes/skins/SkinMustache.php(136): SkinCitizen->getTemplateData()
#4 /var/www/html/includes/skins/SkinTemplate.php(146): SkinMustache->generateHTML()
#5 /var/www/html/includes/OutputPage.php(2634): SkinTemplate->outputPage()
#6 /var/www/html/includes/exception/MWExceptionRenderer.php(147): OutputPage->output()
#7 /var/www/html/includes/exception/MWExceptionRenderer.php(66): MWExceptionRenderer::reportHTML(TypeError)
#8 /var/www/html/includes/exception/MWExceptionHandler.php(106): MWExceptionRenderer::output(TypeError, integer)
#9 /var/www/html/includes/exception/MWExceptionHandler.php(185): MWExceptionHandler::report(TypeError)
#10 /var/www/html/includes/MediaWiki.php(568): MWExceptionHandler::handleException(TypeError, string)
#11 /var/www/html/index.php(53): MediaWiki->run()
#12 /var/www/html/index.php(46): wfIndexMain()
#13 {main}