From 85def32807a982751c3aa760dbf9577699c01a4c Mon Sep 17 00:00:00 2001
From: Haojun Liao <hjliao@taosdata.com>
Date: Wed, 22 Jul 2020 14:18:18 +0800
Subject: [PATCH] [td-225] add check.

---
 src/tsdb/src/tsdbRead.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/tsdb/src/tsdbRead.c b/src/tsdb/src/tsdbRead.c
index 7577a8e8fc..63ad8701ff 100644
--- a/src/tsdb/src/tsdbRead.c
+++ b/src/tsdb/src/tsdbRead.c
@@ -1492,7 +1492,7 @@ static int32_t getDataBlocksInFilesImpl(STsdbQueryHandle* pQueryHandle, bool* ex
     return code;
   }
 
-  assert(pQueryHandle->pFileGroup != NULL);
+  assert(pQueryHandle->pFileGroup != NULL && pQueryHandle->numOfBlocks > 0);
   cur->slot = ASCENDING_TRAVERSE(pQueryHandle->order)? 0:pQueryHandle->numOfBlocks-1;
   cur->fid = pQueryHandle->pFileGroup->fileId;