PostgreSQL ERROR: canceling statement due to conflict with recovery

I’m getting the following error when running a query on a PostgreSQL db in standby mode. The query that causes the error works fine for 1 month but when you query for more than 1 month an error results.

ERROR: canceling statement due to conflict with recovery
Detail: User query might have needed to see row versions that must be removed

Any suggestions on how to resolve? Thanks

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