diff --git a/flow/connectors/postgres/cdc.go b/flow/connectors/postgres/cdc.go
index b35045b945..fc0063c1ab 100644
--- a/flow/connectors/postgres/cdc.go
+++ b/flow/connectors/postgres/cdc.go
@@ -498,6 +498,10 @@ func (p *PostgresCDCSource) processMessage(batch *model.CDCRecordStream, xld pgl
 		// treat all relation messages as corresponding to parent if partitioned.
 		msg.RelationID = p.getParentRelIDIfPartitioned(msg.RelationID)
 
+		if _, exists := p.SrcTableIDNameMapping[msg.RelationID]; !exists {
+			return nil, nil
+		}
+
 		// TODO (kaushik): consider persistent state for a mirror job
 		// to be stored somewhere in temporal state. We might need to persist
 		// the state of the relation message somewhere