diff --git a/src/balance/src/bnMain.c b/src/balance/src/bnMain.c
index 236b22afafb9ed6ee13acfaf6b831520f2b4d2f6..3055f77e81021c4877d97147033fc34f4c525df9 100644
--- a/src/balance/src/bnMain.c
+++ b/src/balance/src/bnMain.c
@@ -425,7 +425,7 @@ static bool bnMonitorVgroups() {
 
   while (1) {
     pIter = mnodeGetNextVgroup(pIter, &pVgroup);
-    if (pVgroup == NULL) break;
+    if (pVgroup == NULL || pVgroup->pDb == NULL) break;
 
     int32_t dbReplica = pVgroup->pDb->cfg.replications;
     int32_t vgReplica = pVgroup->numOfVnodes;
@@ -721,4 +721,4 @@ int32_t bnAlterDnode(struct SDnodeObj *pSrcDnode, int32_t vnodeId, int32_t dnode
   mnodeDecDnodeRef(pDestDnode);
 
   return code;
-}
\ No newline at end of file
+}