diff --git a/script/RobotTCP.py b/script/RobotTCP.py
index 07670e7..20a455e 100644
--- a/script/RobotTCP.py
+++ b/script/RobotTCP.py
@@ -130,7 +130,7 @@ class RobotTCP(TcpDevice):
     def get_safety_fault_signal(self):
         fault = eval_bool("safetyFault(s)")
         if (fault):
-            return get_str("s")            
+            return get_str("")            
 
         
     def is_powered(self):