diff --git a/source/common/src/tmisce.c b/source/common/src/tmisce.c
index 0a9e8f434b..d2b52b201e 100644
--- a/source/common/src/tmisce.c
+++ b/source/common/src/tmisce.c
@@ -228,6 +228,8 @@ int32_t dumpConfToDataBlock(SSDataBlock* pBlock, int32_t startCol) {
   blockDataEnsureCapacity(pBlock, cfgGetSize(pConf));
   SConfigIter* pIter = cfgCreateIter(pConf);
 
+  cfgLock(pConf);
+
   while ((pItem = cfgNextIter(pIter)) != NULL) {
     col = startCol;
 
@@ -253,6 +255,8 @@ int32_t dumpConfToDataBlock(SSDataBlock* pBlock, int32_t startCol) {
     numOfRows++;
   }
 
+  cfgUnLock(pConf);
+
   pBlock->info.rows = numOfRows;
 
   cfgDestroyIter(pIter);