diff --git a/source/dnode/vnode/src/tsdb/tsdbMemTable.c b/source/dnode/vnode/src/tsdb/tsdbMemTable.c
index 15fdbe2212b299ffc1700e8db331f5699f893159..d0ff403bf70a96f114b0722bfb13f7ce035edfb4 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMemTable.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMemTable.c
@@ -287,12 +287,12 @@ int64_t tsdbCountTbDataRows(STbData *pTbData) {
   int64_t rowsNum = 0;
   
   while (NULL != pNode) {
+    pNode = SL_GET_NODE_FORWARD(pNode, 0);
     if (pNode == pTbData->sl.pTail) {
       return rowsNum;
     }
 
     rowsNum++;
-    pNode = SL_GET_NODE_FORWARD(pNode, 0);
   }
 
   return rowsNum;