diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index 7dfab427b598e5bb2a1edb93f1888b7a8136ed00..99cddc17d36212d8da256c215619e276eb14cf1e 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -2577,6 +2577,9 @@ void* tscVgroupInfoClear(SVgroupsInfo *vgroupList) {
     for(int32_t j = 0; j < pVgroupInfo->numOfEps; ++j) {
       tfree(pVgroupInfo->epAddr[j].fqdn);
     }
+    for(int32_t j = pVgroupInfo->numOfEps; j < TSDB_MAX_REPLICA; j++) {
+      assert( pVgroupInfo->epAddr[j].fqdn == NULL );
+    }
   }
 
   tfree(vgroupList);