@aasimali i don't know how i can replicate this issue.

I would sugest to disable error reporting on a live site (should not show the message) and check if it is a Core or component (JomSocial?) issue. If it is a Core issue we need a way to replicate it with the core.

@zero-24
I know that's difficult to reproduce but I am sure, Its coming from Joomla. The issue is in session.php file at line number 658

As you can see the path: /home/aasim/httpdocs/lmsbeta/libraries/joomla/session/session.php on line 658

I know that's difficult to reproduce but I am sure, Its coming from Joomla.

Sure but it can also come from the 3party component. Here it sounds like a not closed session_start() and it don't show the point where the first session_start() is called and not closed.

Can you retest with current staging (3.4-dev)? As we have also file changes in this files so we can be sure that the issue still exists.

Yeah! Sure . I'll test it on staging site

Indeed sounds like a system plugin is starting a session before Joomla does. So make sure you have disabled all 3rd party (system) plugins when testing.

We haven't changed the sessions pretty much since 1.5. I did a refactor here #5088. But even that is unlikely to fix your issue - I suspect as has been mentioned a 3rd party service is intialising the session before Joomla. And you can only have one session open at a time so everything falls apart from there.

I am closing this as an unconfirmed report at this time. It can always be re-opened if further information is provided that allows this to be replicated