Portfolio: team velocity triggers "Unknown exception" error

[Eugene G]

Jira server v8.9.0
Advanced Roadmaps for Jira v3.27.0 (issue also reproduced in v3.29.0)

Old planning interface throws a strange error once I click the "Velocity" dropdown in Teams view:



With indefinite details:

And uninformative logs:

Team (private or shared) must include at least one member.

Could somebody advise on possible root cause? Is it expected behavior and I have to switch to improved interface? (there are no any similar error after switching, BTW). 
Probably old interface even is not supported anymore, dunno.

Let me know if additional details are required.
TIA!

[Lachlan G]

Hey Eugene,

Thanks for reporting this we looked into it and could reproduce on our side. We've fixed the problem and it will be released with 3.29.1. I don't have a date for you on when that will go out but it shouldn't be too long. If you watch this ticket you should get an email when it is resolved for good. https://jira.atlassian.com/browse/JPOSERVER-2798

Thanks again!

[Eugene G]

Hi, Lachlan!

Thank you very much for registering the bug.
Looking forward to 3.29.1 release.

Regards.