diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index ebd42096795..f441ec43314 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -29095,7 +29095,8 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
         The copied physical slot starts to reserve WAL from the same <acronym>LSN</acronym> as the
         source slot.
         <parameter>temporary</parameter> is optional. If <parameter>temporary</parameter>
-        is omitted, the same value as the source slot is used.
+        is omitted, the same value as the source slot is used. Copy of an
+        invalidated slot is not allowed.
        </para></entry>
       </row>
 
@@ -29120,7 +29121,8 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
         The <literal>failover</literal> option of the source logical slot
         is not copied and is set to <literal>false</literal> by default. This
         is to avoid the risk of being unable to continue logical replication
-        after failover to standby where the slot is being synchronized.
+        after failover to standby where the slot is being synchronized. Copy of
+        an invalidated slot is not allowed.
        </para></entry>
       </row>
 
diff --git a/src/backend/replication/slotfuncs.c b/src/backend/replication/slotfuncs.c
index 43c3cc7336b..01e98bc1cef 100644
--- a/src/backend/replication/slotfuncs.c
+++ b/src/backend/replication/slotfuncs.c
@@ -681,6 +681,13 @@ copy_replication_slot(FunctionCallInfo fcinfo, bool logical_slot)
 				(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
 				 errmsg("cannot copy a replication slot that doesn't reserve WAL")));
 
+	/* Cannot copy an invalidated replication slot */
+	if (first_slot_contents.data.invalidated != RS_INVAL_NONE)
+		ereport(ERROR,
+				errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
+				errmsg("cannot copy invalidated replication slot \"%s\"",
+					   NameStr(*src_name)));
+
 	/* Overwrite params from optional arguments */
 	if (PG_NARGS() >= 3)
 		temporary = PG_GETARG_BOOL(2);
@@ -782,6 +789,20 @@ copy_replication_slot(FunctionCallInfo fcinfo, bool logical_slot)
 							NameStr(*src_name)),
 					 errhint("Retry when the source replication slot's confirmed_flush_lsn is valid.")));
 
+		/*
+		 * Copying an invalid slot doesn't make sense. Note that the source
+		 * slot can become invalid after we create the new slot and copy the
+		 * data of source slot. This is possible because the operations in
+		 * InvalidateObsoleteReplicationSlots() are not serialized with this
+		 * function. Even though we can't detect such a case here, the copied
+		 * slot will become invalid in the next checkpoint cycle.
+		 */
+		if (second_slot_contents.data.invalidated != RS_INVAL_NONE)
+			ereport(ERROR,
+					errmsg("cannot copy replication slot \"%s\"",
+						   NameStr(*src_name)),
+					errdetail("The source replication slot was invalidated during the copy operation."));
+
 		/* Install copied values again */
 		SpinLockAcquire(&MyReplicationSlot->mutex);
 		MyReplicationSlot->effective_xmin = copy_effective_xmin;
diff --git a/src/test/recovery/t/035_standby_logical_decoding.pl b/src/test/recovery/t/035_standby_logical_decoding.pl
index aeb79f51e71..4eca17885d6 100644
--- a/src/test/recovery/t/035_standby_logical_decoding.pl
+++ b/src/test/recovery/t/035_standby_logical_decoding.pl
@@ -583,6 +583,15 @@ check_pg_recvlogical_stderr($handle,
 	"can no longer get changes from replication slot \"vacuum_full_activeslot\""
 );
 
+# Attempt to copy an invalidated logical replication slot
+($result, $stdout, $stderr) = $node_standby->psql(
+	'postgres',
+	qq[select pg_copy_logical_replication_slot('vacuum_full_inactiveslot', 'vacuum_full_inactiveslot_copy');],
+	replication => 'database');
+ok( $stderr =~
+	  /ERROR:  cannot copy invalidated replication slot "vacuum_full_inactiveslot"/,
+	"invalidated slot cannot be copied");
+
 # Turn hot_standby_feedback back on
 change_hot_standby_feedback_and_wait_for_xmins(1, 1);