Catchable fatal error: Argument 1 passed to Model_Koszyk::addPozycja() must be an instance of Model_Base_Abstract, null given, called in /home/marcello/ftp/MARCELLO_SKLEP_NEW/application/models/KoszykMapper.php on line 11 and defined in /home/marcello/ftp/MARCELLO_SKLEP_NEW/application/models/Koszyk.php on line 71