diff --git a/SW/PC/Stopwatch/registrace.py b/SW/PC/Stopwatch/registrace.py
index e008999..4915791 100644
--- a/SW/PC/Stopwatch/registrace.py
+++ b/SW/PC/Stopwatch/registrace.py
@@ -55,12 +55,16 @@ class Worker(QtCore.QThread):
     def worker(self):
         while True:
             item = queue.get()
-            log.append(item)
+            log.append({
+                'url': item['url'],
+                'json': item['json'],
+            })
             with open('log.json', 'w') as f:
                 f.write(json.dumps(log))
             response = session.post(item['url'], json=item['json'])
-            
             if response.status_code == 200:
+                if item.get('on_success'):
+                    item['on_success']()
                 if item.get('message'):
                     self.returned_state.emit(f'{item['message']}')
             else:
@@ -90,19 +94,20 @@ def register_racer():
         starting_number = 1
     racer = list(filter(lambda x: x['racer_id'] == racer_id, racers))[0]
 
+    def update_racer():
+        racer['card_id'] = card_id
+        racer['starting_number'] = starting_number
+        racer['started'] = False
+        updateRacers()
+
     queue.put({
         'url': config['host'] + '/api/card/register',
         'json': {'racer_id': racer_id, 'starting_number': starting_number, 'card_id': card_id, 'time': datetime.datetime.now().strftime('%d.%m.%Y %H:%M:%S.%f')},
         'message': f"Úspěšné zaregistrování závodníka {racer['first_name']} {racer['last_name']} se startovním číslem {starting_number}!",
-        'failed': f"Neúspěšná registrace závodníka {racer['first_name']} {racer['last_name']}"
+        'failed': f"Neúspěšná registrace závodníka {racer['first_name']} {racer['last_name']}",
+        'on_success': update_racer,
     })
 
-    racer['card_id'] = card_id
-    racer['starting_number'] = starting_number
-    racer['started'] = False
-    updateRacers()
-
-
 
 model = QtGui.QStandardItemModel()
 
diff --git a/SW/PC/Stopwatch/usbcardreader.py b/SW/PC/Stopwatch/usbcardreader.py
index 39f4619..4c09da8 100644
--- a/SW/PC/Stopwatch/usbcardreader.py
+++ b/SW/PC/Stopwatch/usbcardreader.py
@@ -48,4 +48,4 @@ class UsbCardReader:
             except:
                 pass
 
-            time.sleep(0.001)
\ No newline at end of file
+            time.sleep(0.001)