diff --git a/source/client/src/clientImpl.c b/source/client/src/clientImpl.c
index 25ba63fd344cc99e89bdf80952066f262963f53e..3605f49a5ce5e0ef00adbe1d3159225dd3be6049 100644
--- a/source/client/src/clientImpl.c
+++ b/source/client/src/clientImpl.c
@@ -1905,6 +1905,10 @@ int32_t appendTbToReq(SArray* pList, int32_t pos1, int32_t len1, int32_t pos2, i
     tbLen = len1;
   }
 
+  if (dbLen <= 0 || tbLen <= 0) {
+    return -1;
+  }
+
   if (tNameSetDbName(&name, acctId, dbName, dbLen)) {
     return -1;
   }