Good Morning!
I was checking my error logs and found the following lines:
ERROR - Severity: Warning --> session_start(): The session id is too long or contains illegal characters, valid characters are a-z, A-Z, 0-9 and '-,' /var/www/cmo/system/libraries/Session/drivers/Session_native.php 123
ERROR - Severity: Warning --> Unknown: The session id is too long or contains illegal characters, valid characters are a-z, A-Z, 0-9 and '-,' Unknown 0
ERROR - Severity: Warning --> Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/lib/php5) Unknown 0