diff --git a/User_Interface.py b/User_Interface.py
index 6b2aa7e..b60490f 100644
--- a/User_Interface.py
+++ b/User_Interface.py
@@ -961,9 +961,8 @@ class StatusDisplay(Frame):
         self.update_labels()
 
     def continuous_label_update(self, controller, interval):  # update display values in regular intervals (ms)
-        self.update_labels()
-        if g.app is not None:  # app ist still running
-            # ToDo (optional): prevent call after program close
+        if not g.exitFlag:  # app ist still running
+            self.update_labels()
             controller.after(interval, lambda: self.continuous_label_update(controller, interval))
 
     def update_labels(self):  # update all values in the status display
diff --git a/csv_threading.py b/csv_threading.py
index 0c9b25d..cda0a42 100644
--- a/csv_threading.py
+++ b/csv_threading.py
@@ -37,7 +37,9 @@ class ExecCSVThread(Thread):
     def stopped(self):
         return self.__stop_event.is_set()
 
-    def execute_sequence(self, array, delay, parent, controller):  # runs through array containing times and desired field vectors
+    def execute_sequence(self, array, delay, parent, controller):
+        # runs through array with times and desired fields and commands test stand accordingly
+
         # array format: [time (s), xField (T), yField (T), zField (T)]
         # decimal commas
         # all times in seconds