Unable to access "changes" menu. Cannot read properties of null (reading 'firstName')

We get this message: Sorry, but something went wrong.
Our team has been notified and we are investigating.
Event Id: 7cc9a9461ceb4cbc834ccec41ab8d0e5.
TypeError: Cannot read properties of null (reading 'firstName')

Wondering if the reason is that none of our 3 suscribers have that field populated?
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