diff --git a/utils.py b/utils.py
index c74f0d6..fd969f0 100644
--- a/utils.py
+++ b/utils.py
@@ -117,7 +117,7 @@ class RobotClient:
         """
         cmd = {"command": "move_line", "joint_radian": joint_radian}
         ret = self._send(cmd)
-        if ret.get("ret") != 0:
+        if ret.get("msg") == "succ" or ret.get("ret") != 3004:
             raise RuntimeError(f"move_line failed: {ret}")
 
     def set_joint_maxacc(self, acc: float):