diff --git a/src/backend/access/heap/heapam.c b/src/backend/access/heap/heapam.c
index 595dead..860fd20 100644
--- a/src/backend/access/heap/heapam.c
+++ b/src/backend/access/heap/heapam.c
@@ -5367,7 +5367,11 @@ newt:;
 								 ItemPointerGetBlockNumber(&(xlrec->newtid)),
 								 false);
 		if (!BufferIsValid(nbuffer))
+		{
+			if (BufferIsValid(obuffer))
+				UnlockReleaseBuffer(obuffer);
 			return;
+		}
 		page = (Page) BufferGetPage(nbuffer);
 
 		if (XLByteLE(lsn, PageGetLSN(page)))	/* changes are applied */