Researching the new research added in the latest update crashes the game when using Concurrent Research

The mod Concurrent Research (0.1.1) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event concurrent-research::on_research_finished (ID 22)
The mod Concurrent Research (0.1.1) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event concurrent-research::on_research_finished (ID 22)
The mod Concurrent Research (0.1.1) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event concurrent-research::on_research_finished (ID 22)
The mod Concurrent Research (0.1.1) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event concurrent-research::on_research_finished (ID 22)
The mod D.A.R.T. (1.2.1) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event dart::on_research_finished (ID 22)
dart/scripts/dart.lua:1112: attempt to index local 'fd' (a nil value)
stack traceback:
dart/scripts/dart.lua:1112: in function 'handler'
core/lualib/event_handler.lua:72: in function <core/lualib/event_handler.lua:70>
stack traceback:
[C]: in function 'research_recursive'
concurrent-research/control.lua:93: in function <concurrent-research/control.lua:82>
stack traceback:
[C]: in function 'research_recursive'
concurrent-research/control.lua:93: in function <concurrent-research/control.lua:82>
stack traceback:
[C]: in function 'research_recursive'
concurrent-research/control.lua:93: in function <concurrent-research/control.lua:82>
stack traceback:
[C]: in function 'research_recursive'
concurrent-research/control.lua:93: in function <concurrent-research/control.lua:82>

Are you using this mod?

If yes:
1st - it's deprecated
2nd - according to it's own information page "mod compatibility: will probably break with anything that deals with teams/forces, or changes the research queue. should work with disco science "

If no: Could you please publish the link to its mod page - searching in the mod portal with"research" gives me > 100 hits and searching with "Concurrent Research" none.

Nevertheless I'll try to mitigate this - but I am not sure that D.A.R.T. will work properly with this mod as the code location mentioned above deals with forces.

Do you still have the factorio-current.log / factorio-previous.log from the run when the crash occurred? If yes - could you please share them?

Was able to reproduce your problem with this mod. Surprising idea to have forces, that do research, but aren't players - but these triggered the crash.

V1.2.2 fixes that, and my earlier concerns have vanished.

Sorry for the lack of response. Yes, I am using that Concurrent Research. I didn't even realize that it's deprecated since I haven't had any issues with it until your most recent update and some minor bugs with Rubia.
Very happy that you were able to fix the crash.
Also:
I guess I'll look into alternatives to Concurrent Research. I just saw that a different mod was uploaded 15 days ago, so I'll have to give that a try. It's just such a shame that with mods like Metal & Stars it's basically mandatory to have that unless you want to have to choose which research you want to do, despite M&S having completely separate science packs and labs.