From 2c800e3cccfaf5cfabf226b4cdf71af6a83fd15a Mon Sep 17 00:00:00 2001
From: slguan <slguan@taosdata.com>
Date: Thu, 12 Sep 2019 15:24:00 +0800
Subject: [PATCH] fix issue #502

---
 src/system/src/vnodeMeter.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/system/src/vnodeMeter.c b/src/system/src/vnodeMeter.c
index bffcf849b5..9be2873086 100644
--- a/src/system/src/vnodeMeter.c
+++ b/src/system/src/vnodeMeter.c
@@ -637,6 +637,10 @@ _over:
 void vnodeProcessUpdateSchemaTimer(void *param, void *tmrId) {
   SMeterObj * pObj = (SMeterObj *)param;
   SVnodeObj * pVnode = vnodeList + pObj->vnode;
+  if (pVnode->meterList == NULL) {
+    dTrace("vnode is deleted, abort update schema");
+    return;
+  }
   SCachePool *pPool = (SCachePool *)pVnode->pCachePool;
 
   pthread_mutex_lock(&pPool->vmutex);
-- 
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