BUG #17529: SQL Error [57P01]: FATAL: terminating connection due to administrator command

The following bug has been logged on the website:

Bug reference: 17529
Logged by: Kevin Wolf
Email address: kwolf(at)veritone(dot)com
PostgreSQL version: 11.8
Operating system: macbook
Description:

When running the following command, it returns the terminating connection
error message due to administrator command

SELECT i.indexrelid::regclass,
s.leaf_fragmentation
FROM pg_index AS i
JOIN pg_class AS t ON i.indexrelid = t.oid
JOIN pg_opclass AS opc ON i.indclass[0] = opc.oid
JOIN pg_am ON opc.opcmethod = pg_am.oid
CROSS JOIN LATERAL pgstatindex(i.indexrelid) AS s
where s.leaf_fragmentation > 80
and s.leaf_fragmentation != 'NaN'::NUMERIC
--order by 2 desc
limit 10

Additional error info: data source was invalidated