From 6b49d26693110381549d9b3e18c47d82e42aab73 Mon Sep 17 00:00:00 2001
From: Haojun Liao <hjliao@taosdata.com>
Date: Sat, 24 Oct 2020 16:45:09 +0800
Subject: [PATCH] [td-1373]

---
 src/query/src/qExecutor.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index 47a5e1522f..a994f815f9 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -1410,7 +1410,9 @@ static void rowwiseApplyFunctions(SQueryRuntimeEnv *pRuntimeEnv, SDataStatis *pS
     item->lastKey = (QUERY_IS_ASC_QUERY(pQuery)? pDataBlockInfo->window.ekey:pDataBlockInfo->window.skey) + step;
   }
 
-  item->cur = tsBufGetCursor(pRuntimeEnv->pTSBuf);
+  if (pRuntimeEnv->pTSBuf != NULL) {
+    item->cur = tsBufGetCursor(pRuntimeEnv->pTSBuf);
+  }
 
   // todo refactor: extract method
   for(int32_t i = 0; i < pQuery->numOfOutput; ++i) {
-- 
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