OJS 3.1.0.1 PHP Errors

Hi, I have noticed that we have a lot of warnings in error log that are pointing to Context.inc.php on line 273

[Sun Feb 11 00:04:50.352581 2018] [fcgid:warn] [pid 15342] [client 66.249.69.81:40754] mod_fcgid: stderr: PHP Notice:  Undefined offset: 0 in /var/www/clients/client0/web7/web/lib/pkp/classes/context/Context.inc.php on line 273
[Sun Feb 11 00:33:27.722649 2018] [fcgid:warn] [pid 18794] [client 68.180.230.112:43568] mod_fcgid: stderr: PHP Notice:  Undefined offset: 0 in /var/www/clients/client0/web7/web/lib/pkp/classes/context/Context.inc.php on line 273
[Sun Feb 11 02:50:06.322309 2018] [fcgid:warn] [pid 49924] [client 66.249.79.19:40523] mod_fcgid: stderr: PHP Notice:  Undefined offset: 0 in /var/www/clients/client0/web7/web/lib/pkp/classes/context/Context.inc.php on line 273
[Thu Feb 15 06:52:48.602997 2018] [fcgid:warn] [pid 1832] [client 66.249.66.19:43539] mod_fcgid: stderr: PHP Notice:  Undefined offset: 0 in /var/www/clients/client0/web7/web/lib/pkp/classes/context/Context.inc.php on line 273
[Sun Feb 18 01:51:54.676672 2018] [fcgid:warn] [pid 19395] [client 54.87.206.34:59004] mod_fcgid: stderr: PHP Notice:  Undefined offset: 0 in /var/www/clients/client0/web7/web/lib/pkp/classes/context/Context.inc.php on line 273
[Sun Feb 18 03:39:11.177714 2018] [fcgid:warn] [pid 23727] [client 46.229.168.67:15820] mod_fcgid: stderr: PHP Notice:  Undefined offset: 0 in /var/www/clients/client0/web7/web/lib/pkp/classes/context/Context.inc.php on line 273
[Sun Feb 18 17:05:27.303780 2018] [fcgid:warn] [pid 59412] [client 163.172.71.24:55075] mod_fcgid: stderr: PHP Notice:  Undefined offset: 0 in /var/www/clients/client0/web7/web/lib/pkp/classes/context/Context.inc.php on line 273