diff --git a/src/system/detail/src/vnodeCache.c b/src/system/detail/src/vnodeCache.c
index 36bf87210927a7280a425ee5c4c20af65b0a78c0..182717c1ab85353a71701073c0213bcf106090f8 100644
--- a/src/system/detail/src/vnodeCache.c
+++ b/src/system/detail/src/vnodeCache.c
@@ -966,6 +966,7 @@ void vnodeSetCommitQuery(SMeterObj *pObj, SQuery *pQuery) {
         pObj->vnode, pObj->sid, pObj->meterId, firstKey, pQuery->skey);
     pthread_mutex_lock(&(pVnode->vmutex));
     if (firstKey < pVnode->firstKey) pVnode->firstKey = firstKey;
+    assert(pVnode->firstKey > 0);
     pthread_mutex_unlock(&(pVnode->vmutex));
   }
 }
diff --git a/src/system/detail/src/vnodeMeter.c b/src/system/detail/src/vnodeMeter.c
index 06d0fd8b681e10a6d489006fec9a1fc4b28b12e2..1c91b53428d5462099763946ee27321b27a14703 100644
--- a/src/system/detail/src/vnodeMeter.c
+++ b/src/system/detail/src/vnodeMeter.c
@@ -655,6 +655,7 @@ int vnodeInsertPoints(SMeterObj *pObj, char *cont, int contLen, char source, voi
   if (pObj->lastKey > pVnode->lastKey) pVnode->lastKey = pObj->lastKey;
 
   if (firstKey < pVnode->firstKey) pVnode->firstKey = firstKey;
+  assert(pVnode->firstKey > 0);
 
   pVnode->version++;