diff --git a/src/client/src/tscParseLineProtocol.c b/src/client/src/tscParseLineProtocol.c
index 342ad8b7610cfabeab2b7e53371330a5ff94ca13..559a488b8a6c2e0828c76688df07fa2093392284 100644
--- a/src/client/src/tscParseLineProtocol.c
+++ b/src/client/src/tscParseLineProtocol.c
@@ -97,9 +97,9 @@ static int32_t getFieldBytesFromSmlKv(TAOS_SML_KV* kv, int32_t* bytes, uint64_t
 //      }
 //      free(ucs);
 //      *bytes =  bytesNeeded + VARSTR_HEADER_SIZE;
-      *bytes = kv->length * TSDB_NCHAR_SIZE + VARSTR_HEADER_SIZE;
+      *bytes = (kv->length == 0 ? 1 : kv->length) * TSDB_NCHAR_SIZE + VARSTR_HEADER_SIZE;
     } else if (kv->type == TSDB_DATA_TYPE_BINARY) {
-      *bytes = kv->length + VARSTR_HEADER_SIZE;
+      *bytes = (kv->length == 0 ? 1 : kv->length) + VARSTR_HEADER_SIZE;
     }
   }
   return 0;