Starting two sessions for the same user I get this:
> $ tl-session-param -a /
> Multiple sessions matching current information. Should not happen! Exiting
Seen on RHEL 7.
This got broken by r29187 for bug 5192 back in 2014. Not sure how this went unnoticed for so long.
Could reproduce the issue on RHEL 7 using 4.11. This bug is fixed in the nightly build 6459.
Also checked the nightly build on Ubuntu 18, basic session handling seems to work well.