Merge pull request #2006 from taosdata/hotfix/heartbeat

[TD-396]

src/client/src/tscLocal.c

@@ -436,7 +436,7 @@ static void tscProcessServStatus(SSqlObj *pSql) {
       return;
     } else {
       int32_t* data = (int32_t*) pObj->pHb->res.data;
-      
+      if (data != NULL) {
         int32_t totalDnode = data[0];
         int32_t onlineDnode = data[1];
         assert(onlineDnode <= totalDnode);
@@ -446,6 +446,8 @@ static void tscProcessServStatus(SSqlObj *pSql) {
           return;
         }
       }
+      
+    }
   } else {
     if (pSql->res.code == TSDB_CODE_NETWORK_UNAVAIL) {
       return;