diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index 98f959a799..56d1cb9d10 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -4013,6 +4013,7 @@ void tsdbReaderClose(STsdbReader* pReader) {
 
   qTrace("tsdb/reader: %p, untake snapshot", pReader);
   tsdbUntakeReadSnap(pReader, pReader->pReadSnap, true);
+  pReader->pReadSnap = NULL;
 
   taosThreadMutexDestroy(&pReader->readerMutex);