diff --git a/SW/PC/Stopwatch/registrace.py b/SW/PC/Stopwatch/registrace.py
index c7f386c..92867fd 100644
--- a/SW/PC/Stopwatch/registrace.py
+++ b/SW/PC/Stopwatch/registrace.py
@@ -62,7 +62,7 @@ threading.Thread(target=worker).start()
 def register_racer():
     card_id = last_card
     index = window.racers.currentIndex()
-    if not index:
+    if not index.data():
         mb = QtWidgets.QMessageBox(text='Prosím vyberte závodníka!')
         mb.exec()
         return
diff --git a/SW/PC/Stopwatch/usbcardreader.py b/SW/PC/Stopwatch/usbcardreader.py
index c149192..39f4619 100644
--- a/SW/PC/Stopwatch/usbcardreader.py
+++ b/SW/PC/Stopwatch/usbcardreader.py
@@ -1,6 +1,7 @@
 import usb.core
 import usb.util
-
+import threading
+import time
 
 
 USB_IF      = 0 # Interface
@@ -33,13 +34,13 @@ class UsbCardReader:
             control = None
             try:
                 control = self.dev.read(self.endpoint.bEndpointAddress, self.endpoint.wMaxPacketSize, USB_TIMEOUT)
-                if (control[2] != 40) & (control[2] != 0):
+                if (control[2] != 40) and (control[2] != 0):
                     receivedDigit = control[2] - 29
                     if receivedDigit == 10:
                         receivedDigit = 0
                     receivedNumber = 10 * receivedNumber + receivedDigit
 
-                if (( control[0] == 0 )) & (( control[2] == 40 )) & (( not receivedNumber == 0 )):
+                if ( control[0] == 0 ) and ( control[2] == 40 ) and ( not receivedNumber == 0 ):
                     self.callback(receivedNumber)
                     receivedNumber = 0
             except KeyboardInterrupt: