diff --git a/src/backend/storage/ipc/standby.c b/src/backend/storage/ipc/standby.c
index f9c12e603b..9de46e0bea 100644
--- a/src/backend/storage/ipc/standby.c
+++ b/src/backend/storage/ipc/standby.c
@@ -632,6 +632,7 @@ StandbyAcquireAccessExclusiveLock(TransactionId xid, Oid dbOid, Oid relOid)
 	xl_standby_lock *newlock;
 	LOCKTAG		locktag;
 	bool		found;
+	ListCell   *lc;

 	/* Already processed? */
 	if (!TransactionIdIsValid(xid) ||
@@ -653,6 +654,20 @@ StandbyAcquireAccessExclusiveLock(TransactionId xid, Oid dbOid, Oid relOid)
 		entry->locks = NIL;
 	}

+	/*
+	 * multple lock for the same object can be given by XLOG_STANDBY_LOCK logs.
+	 * we need no more than one of them.
+	 */
+	foreach (lc, entry->locks)
+	{
+		xl_standby_lock *l = (xl_standby_lock *) lfirst(lc);
+
+		Assert(l->xid == xid);
+
+		if (l->dbOid == dbOid && l->relOid == relOid)
+			return;
+	}
+
 	newlock = palloc(sizeof(xl_standby_lock));
 	newlock->xid = xid;
 	newlock->dbOid = dbOid;