diff --git a/dynamixelmotorsapi/_motorgroup.py b/dynamixelmotorsapi/_motorgroup.py
index 36a262b..bf869a3 100644
--- a/dynamixelmotorsapi/_motorgroup.py
+++ b/dynamixelmotorsapi/_motorgroup.py
@@ -528,7 +528,7 @@ def __writeSyncMotorsData(self, writer_name: str, values: list):
                 val = values_by_id[cfg.id]
                 if group.data_length == 1:
                     data = [val]
-                if group.data_length == 2:
+                elif group.data_length == 2:
                     data = _valTo2Bytes(val)
                 elif group.data_length == 4:
                     data = _valToArray(val)