Internal Server Error

openssl_encrypt(): Passing null to parameter #1 ($data) of type string is deprecated

[core/settings.php:129] 
[core/settings.php:129] openssl_encrypt()
[core/settings.php:77] settings::encrypt()
[core/settings.php:14] settings->build()
[config/fwbha.com/define.php:19] settings->__construct()
[/home/unity/lib/bootstrap.php:26] require_once('/home/unity/httpdocs/config/fwbha.com/define.php')
[locations/index.php:7] include('/home/unity/lib/bootstrap.php')