From b7c31e9c06240d80811ffdc864a972fb4110f9e3 Mon Sep 17 00:00:00 2001
From: Shengliang Guan <slguan@taosdata.com>
Date: Wed, 23 Mar 2022 20:22:22 +0800
Subject: [PATCH] crash while show stables

---
 source/dnode/mnode/impl/src/mndStb.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/source/dnode/mnode/impl/src/mndStb.c b/source/dnode/mnode/impl/src/mndStb.c
index 09692a729b..e8d6157661 100644
--- a/source/dnode/mnode/impl/src/mndStb.c
+++ b/source/dnode/mnode/impl/src/mndStb.c
@@ -1582,7 +1582,11 @@ static int32_t mndRetrieveStb(SNodeMsg *pReq, SShowObj *pShow, char *data, int32
     cols++;
 
     pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
-    STR_TO_VARSTR(pWrite, pStb->comment);
+    if (pStb->commentLen != 0) {
+      STR_TO_VARSTR(pWrite, pStb->comment);
+    } else {
+      STR_TO_VARSTR(pWrite, "");
+    }
     cols++;
 
     numOfRows++;