diff --git a/doc/src/sgml/system-views.sgml b/doc/src/sgml/system-views.sgml
index a54f4a4743..8c18bea902 100644
--- a/doc/src/sgml/system-views.sgml
+++ b/doc/src/sgml/system-views.sgml
@@ -3091,15 +3091,36 @@ SELECT * FROM pg_locks pl LEFT JOIN pg_prepared_xacts ppx
       <para>
        The last sequence value written to disk.  If caching is used,
        this value can be greater than the last value handed out from the
-       sequence.  Null if the sequence has not been read from yet.  Also, if
-       the current user does not have <literal>USAGE</literal>
-       or <literal>SELECT</literal> privilege on the sequence, the value is
-       null.
+       sequence.
       </para></entry>
      </row>
     </tbody>
    </tgroup>
   </table>
+
+  <para>
+   The <structfield>last_value</structfield> column will read as null if any of
+   the following are true:
+   <itemizedlist>
+    <listitem>
+     <para>
+      The sequence has not been read from yet.
+     </para>
+    </listitem>
+    <listitem>
+     <para>
+      The current user does not have <literal>USAGE</literal> or
+      <literal>SELECT</literal> privilege on the sequence.
+     </para>
+    </listitem>
+    <listitem>
+     <para>
+      The sequence is unlogged and the server is a standby.
+     </para>
+    </listitem>
+   </itemizedlist>
+  </para>
+
  </sect1>
 
  <sect1 id="view-pg-settings">
diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index 46103561c3..28f8522264 100644
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -1777,11 +1777,8 @@ pg_sequence_last_value(PG_FUNCTION_ARGS)
 	Oid			relid = PG_GETARG_OID(0);
 	SeqTable	elm;
 	Relation	seqrel;
-	Buffer		buf;
-	HeapTupleData seqtuple;
-	Form_pg_sequence_data seq;
-	bool		is_called;
-	int64		result;
+	bool		is_called = false;
+	int64		result = 0;
 
 	/* open and lock sequence */
 	init_sequence(relid, &elm, &seqrel);
@@ -1792,12 +1789,28 @@ pg_sequence_last_value(PG_FUNCTION_ARGS)
 				 errmsg("permission denied for sequence %s",
 						RelationGetRelationName(seqrel))));
 
-	seq = read_seq_tuple(seqrel, &buf, &seqtuple);
+	/*
+	 * We return NULL for other sessions' temporary sequences.  The
+	 * pg_sequences system view already filters those out, but this offers a
+	 * defense against ERRORs in case someone invokes this function directly.
+	 *
+	 * Also, for the benefit of the pg_sequences view, we return NULL for
+	 * unlogged sequences on standbys instead of throwing an error.
+	 */
+	if (!RELATION_IS_OTHER_TEMP(seqrel) &&
+		(RelationIsPermanent(seqrel) || !RecoveryInProgress()))
+	{
+		Buffer		buf;
+		HeapTupleData seqtuple;
+		Form_pg_sequence_data seq;
 
-	is_called = seq->is_called;
-	result = seq->last_value;
+		seq = read_seq_tuple(seqrel, &buf, &seqtuple);
 
-	UnlockReleaseBuffer(buf);
+		is_called = seq->is_called;
+		result = seq->last_value;
+
+		UnlockReleaseBuffer(buf);
+	}
 	sequence_close(seqrel, NoLock);
 
 	if (is_called)
diff --git a/src/test/recovery/t/001_stream_rep.pl b/src/test/recovery/t/001_stream_rep.pl
index 5311ade509..4c698b5ce1 100644
--- a/src/test/recovery/t/001_stream_rep.pl
+++ b/src/test/recovery/t/001_stream_rep.pl
@@ -95,6 +95,14 @@ $result = $node_standby_2->safe_psql('postgres', "SELECT * FROM seq1");
 print "standby 2: $result\n";
 is($result, qq(33|0|t), 'check streamed sequence content on standby 2');
 
+# Check pg_sequence_last_value() returns NULL for unlogged sequence on standby
+$node_primary->safe_psql('postgres',
+	"CREATE UNLOGGED SEQUENCE ulseq; SELECT nextval('ulseq')");
+$node_primary->wait_for_replay_catchup($node_standby_1);
+is($node_standby_1->safe_psql('postgres',
+	"SELECT pg_sequence_last_value('ulseq'::regclass) IS NULL"),
+	't', 'pg_sequence_last_value() on unlogged sequence on standby 1');
+
 # Check that only READ-only queries can run on standbys
 is($node_standby_1->psql('postgres', 'INSERT INTO tab_int VALUES (1)'),
 	3, 'read-only queries on standby 1');