diff --git a/utapi/base/servo_api_base.py b/utapi/base/servo_api_base.py
index 9d965fd..3d3b1f6 100755
--- a/utapi/base/servo_api_base.py
+++ b/utapi/base/servo_api_base.py
@@ -499,9 +499,9 @@ def _set_cpostau_target(self, sid, eid, pos, tau):
         return 0
 
     def _get_spostau_current(self):
-        self.mutex.acquire()
+        #self.mutex.acquire()
         ret, bus_rmsg = self.__sendpend(UTRC_RW.R, SERVO_REG.SPOSTAU_CURRENT, None)
-        self.mutex.release()
+        #self.mutex.release()
 
         if ret == UTRC_RX_ERROR.TIMEOUT:
             num = 0