bug#46061: 28.0.50; error "‘'postgres’ is not a known product

[Jean Louis]

* Lars Ingebrigtsen <larsi@gnus.org> [2021-01-25 00:31]:
> Jean Louis <bugs@gnu.support> writes:
> 
> > After M-x sql-postgres and clicking on the menu item SQL, I get this
> > error:
> >
> > Debugger entered--Lisp error: (error "‘'postgres’ is not a known product; 
> > use ‘sql-add-product’ to add it first.")
> 
> What's the value of the `sql-connection-alist' variable in the SQL buffer?

(("local" (sql-product 'postgres) (sql-user "username") (sql-password 
"password") (sql-database "mydatabase")))

This problem does not appear always and I cannot reproduce it.