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I am sometime experiencing the following issue with CodeIgniter:

ERROR - 2019-03-05 19:57:26 --> Severity: Warning --> session_start(): Failed to decode session object. Session has been destroyed /system/libraries/Session/Session.php 143

This error appears in my server log and is impossible to artificialy replicate.

I already read the following SO questions:

I also asked on the CodeIgniter forum, but I didn't have any answer.

https://forum.codeigniter.com/thread-72960.html

Here are my session configuration (in application/config/config.php)

$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 7200;
$config['sess_save_path'] = NULL;
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE;

Any ideas what could be the roots of that problem and/or where to start ?

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3 Answers

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I encountered this error when using the database option to store session information. When using this option, CodeIgniter stores session data in a table called ci_sessions, specifically in the 'data' column. By default, CodeIgniter creates this column as a blob datatype which has a maximum data size of 65,535 bytes. My application was exceeding that size and throwing the error. To remedy the issue, I changed the datatype to mediumblob which has a maximum size of 16,777,215 bytes. Afterwards, my application no longer generated the error and worked as expected.

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5

The problem is with this setting

$config['sess_save_path'] = NULL;

When using the "files" driver, which you are, as determined by the following

$config['sess_driver'] = 'files';

$config['sess_save_path'] must be set to the absolute path where the session files will be stored. e.g.

$config['sess_save_path'] = '/var/www/project/sessions/';

When set to NULL all kinds of weird and unpredictable things happen. The folder must also have appropriate ownership and permissions.

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3

In application/config/config.php, set this value:

$config['sess_save_path'] = sys_get_temp_dir();
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