WELD-000321 No conversation found to restore for id 1

Hi,

I am using Glassfish 3.1.2 for JSF 2.0 web application with CDI. I am
seeing org.jboss.weld.context.NonexistentConversationException: WELD-000321
No conversation found to restore for id 1

. This is not frequent..but happens occassionally. Could some one point to
what might be the issue.

there are no timeout settings in my application.

Thanks