This is clearly related to a bug that we have fixed in 2.8.1 (the bug fixing was related to identical in the final state where some diagram were not included). Looks like for your process some 4 body diagram added due to that issue have some issue with the meta-data leading to this crash.
This is likely to be quite long to fix (and I would not recommend to use older version in your case).
Hi,
This is clearly related to a bug that we have fixed in 2.8.1 (the bug fixing was related to identical in the final state where some diagram were not included). Looks like for your process some 4 body diagram added due to that issue have some issue with the meta-data leading to this crash.
This is likely to be quite long to fix (and I would not recommend to use older version in your case).
Cheers,
Olivier