Session warning after logging out of Joomla

Hi,
I'm getting the following warnings when logging out of Joomla:

Warning: session_write_close(): The session id is too long or contains illegal characters, valid characters are a-z, A-Z, 0-9 and '-,' in .../moodle/lib/classes/session/manager.php on line 516

Warning: session_write_close(): Failed to write session data (files). Please verify that the current setting of session.save_path is correct (.../moodledata/sessions) in .../moodle/lib/classes/session/manager.php on line 516
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Please help
Thanks

Hi.

I have never seen that error before, and I don't know how it can happen, as we don't call Moodle code on logout from Joomla.

I assume you have redirect-less logout disabled in Joomla, right?

Yes it is disabled. This is the setup:
I am using the Joomla login form to login to the website. Then I use the JS Hello Me module to logout. I have also tried using the Joomla login form to logout and the warning still comes.
Thanks

I cannot replicate the problem and don't know where it is coming from.

You can send URL and a test user to development@joomdle.com and I will take a look. Maybe seeing it live gives me some ideas.

Can I send you a private message with the link?
Thanks

Yes, in my last post I told you to send me an email to development@joomdle.com with the data.

Hi, Did you come up with a solution for this? I am getting the same error.

I don't know if klever solved his problem.

However, error said:
Failed to write session data (files). Please verify that the current setting of session.save_path is correct (.../moodledata/sessions)

So if you get the same, you should check your session path is correct and writable.

Hi, I got the same warning on my local XAMPP setup, also on logout only from Joomla. The warning message appears briefly (< 1 second) before returning to the website as logged out. What seemed to fix it for me was setting "Use redirectless logout" to Yes. Maybe that can help narrow down the problem area ...

My moodledata directory and all directories/files inside are set to 777 permissions.

VERSION: Joomla 3.4.4, Moodle 2.9, Joomdle 1.0.2, XAMPP 5.6.12-0

UPDATE: Okay, not sure exactly what caused the change in my test setup, but now when I set "Use redirectless logout" back to No the problem does not show anymore . btw, I am using this together with MageBridge.