Garbage collector - PyQt

Hi guys,
I started using pyqt a few weeks ago, I was not sure about where to but this question but as I'm a newbie here it is.

I have list, self.cards, that is [QListWidgetItem, string, QString]
in this function I just iter the elements of this list and populate my QListView (self.cardList).

Code:

---

def updateCardList(self):
		for card_ in self.cards:
			self.cardList.addItem(card_[0])

---

It works fine for this function:

Code:

---

def selectEditionsF(self):
		self.cards=[]
		for sEdition in self.selectedEditions:
			for edition in self.listEditions:
				if sEdition == edition[0]:
					for card in edition[1].iter('card'):
						self.cards.append([QListWidgetItem(card.get('name')), card.get('graphics'), sEdition])
		self.updateCardList()
		self.selectEditionsWindow.close()

---

but in this case:

Code:

---

def refine(self, bool):
                tempcards = self.cards
                self.cards = []
		for card in tempcards:
			if self.refineColor.isChecked():
				if self.colorBlue.isChecked():
					if self.getCardColor(card[0]) == "Blue":
						self.cards.append(card)
		self.updateCardList()

---

When it enters the loop in updateCardList I receive this message: "underlying C/C++ object has been deleted"
Debug I found that inside the function everything is Ok, the error appears just inside the loop.

Any Ideas?