diff --git a/script/RobotTCP.py b/script/RobotTCP.py
index f515bf4..7d63995 100644
--- a/script/RobotTCP.py
+++ b/script/RobotTCP.py
@@ -67,7 +67,7 @@ class RobotTCP(TcpDevice, Stoppable):
     def get_var(self, name):
         return self.execute('get_var', name)
 
-    def get_str(self, name):
+    def get_str(self, name='s'):
         return self.execute('get_str', name)
 
     def get_arr(self, name, size):
@@ -208,7 +208,7 @@ class RobotTCP(TcpDevice, Stoppable):
     def get_safety_fault_signal(self):
         fault = self.eval_bool("safetyFault(s)")
         if (fault):
-            return get_str("")            
+            return get_str()            
         
 
     #Motion control