From 80b7ba902ced89ecfca85dcffd38793e55040d47 Mon Sep 17 00:00:00 2001
From: Haojun Liao <hjliao@taosdata.com>
Date: Sat, 11 Jun 2022 13:48:18 +0800
Subject: [PATCH] fix(query): add null pointer check.

---
 source/common/src/tdatablock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/source/common/src/tdatablock.c b/source/common/src/tdatablock.c
index 04de2738e1..c1f2726629 100644
--- a/source/common/src/tdatablock.c
+++ b/source/common/src/tdatablock.c
@@ -1238,7 +1238,7 @@ SSDataBlock* createOneDataBlock(const SSDataBlock* pDataBlock, bool copyData) {
         return NULL;
       }
 
-      if (pSrc->pData== NULL) {
+      if (pSrc->pData== NULL || pDst->pData == NULL) {
         continue;
       }
       colDataAssign(pDst, pSrc, pDataBlock->info.rows);