PostgreSQL 12 - ERROR: invalid attribute number 2 for ad_user_pkey - Urgent

[FOUTE K . Jaurès]

Hello,

I have a strange issue in a production database on a customer and need to
help to know how to solve the problem.

Any select on the table other than pg_catalog table throws the error  FATAL:
catalog is missing 1 attribute(s) for

Any idea how to solve this issue is really appreciated????


-- 
Jaurès FOUTE