Hi,
I have the exact same problem as Santiago Rubio.
Pie Register Version
Pie Register (Base) 3.0.6
PHP Version 5.5.38
MySQL Version 5.5.5
Wordpress Version 4.8.3
Themes [ACTIVATED]:
Vantage
Plugins [ACTIVATED]:
Coming Soon CC
Page Builder by SiteOrigin
Polylang
SiteOrigin CSS
SiteOrigin Widgets Bundle
Wordfence Security