Badges from Moodle create an error

While using Open Badges 2.0 Validator, we received an incomprehensible error. Previously, the badges were ok. They are of 2020. I just tried to re-validate them. 
![2023-12-20_16-53-43](https://github.com/1EdTech/openbadges-validator-core/assets/36114863/ddeb190f-25e6-421f-8a0f-6b26f689d76d)
