Erro while changing password

I get the following error after I post in my profile.php page:

Warning: Cannot modify header information – headers already sent by (output started at /home/xxxxxxxxxx/public_html/wp-content/plugins/better-wp-security/modules/free/strong-passwords/class-itsec-strong-passwords.php:80) in /home/xxxxxxxxxxx/public_html/wp-includes/pluggable.php on line 896

Please advise!

https://wordpress.org/plugins/better-wp-security/