-small bugfix in destructor

SpectrumAWG/SpectrumCard.py

@@ -22,7 +22,7 @@ class SpectrumCard:
         """
         Destructor method to ensure the connection is closed when the class instance is destroyed.
         """
-        self.close()  # Call the close method to safely close the connection if it's still open
+        self.card_close()  # Call the close method to safely close the connection if it's still open
 
 
     def open(self):
@@ -804,8 +804,9 @@ class SpectrumCard:
         """
         Closes handle to the card.
         """
-        spcm_vClose(self.hCard)
-        self.hCard = None
+        if self.hCard is not None:
+            spcm_vClose(self.hCard)
+            self.hCard = None
 
     def transfer_single_replay_samples(self, samples):
         """