DateTimeZone throws warnings: Unknown or bad timezone ()

I am running NewRelic on my servers and quite often I get warnings notifications when i post an article.

Error message

E_WARNING: DateTimeZone::__construct(): Unknown or bad timezone ()

Sample stack trace

...one::__construct called at /var/www/osb-dedicated-kalilinux/web/phpbb/

user.php (192)

in phpbb\user::setup called at /var/www/osb-dedicated-kalilinux/web/posting.php (239)

Screen shots are attached.

I went and check what's on line 192 from user.php and try/catch it used for debugging or catching exceptions, however, not for assigning values or switching elements.

I've already created a patch for this and currently is running on my live server. (if needed i can provide the URL to the website)