Unsupported operand error interrupted experiments (incorrect error log?)

Autosubmit Version

v3.14.0

Expid affected(If applicable)

t0b[e-v] and others across multiple users.

Which task has issues? Where is the log(If applicable)

Any task in the experiments.

Summary

Friday of last week at a specific time, a lot of experiments across multiple users that were launched using autosubmit suddenly stopped. Although at this point it seems like a one time thing it looks like it's worth investigating its cause. An peculiar error log appeard from some of the jobs that were interrupted. Moreover the error log says to contact the developers via git, which isn't really correct as autosubmit's uses gitlab.

Although the error message is somewhat similar to the one seen in #565 (closed), it seems like a different problem.

Steps to reproduce

As said, it looks more like a one time event not reproducible at a first glance.

What is the current bug behavior?

All running jobs in multiple experiments had their execution suddenly interrupted.

What is the expected correct behavior?

You would expect experiments to have keept executing.

Relevant logs and/or screenshots(if applicable)

[ERROR] 2023-03-10 14:48:31,210 Trace: unsupported operand type(s) for +: 'NoneType' and 'str'
[CRITICAL] 2023-03-10 14:48:31,211 There is a bug in the code, please contact via git [eCode=7070]
2023-03-10 14:48:31,211 More info at https://autosubmit.readthedocs.io/en/v3.14.0/troubleshooting/error-codes.html