Experiment cannot be deleted, despite not being attested

This experiment:

tpereira / tutorial / full_fisherface / 1 / PCA-200_LDA-49_periocular_mobio-male

Is shared with the team system/administrators, so all of us have access to it. It has no attestations attached to it. If the user (tpereira) logs in and then tries to push the "Delete" button, which is enabled for this experiment, then it gets: