An issue with removing files from custom model

[Jakub Lamprecht]

Hey,

at first I wanted to mention that I'm no expert in Python/Django. So I have this app that is a storage an each stored item has an image. The problem is that when I click the red cross next to the picture or check box in item modification page in administration panel and then click save i get this error: "

'NoneType' object has no attribute 'original_filename'



On the other hand, deleting this image file directly from filer page works flawlessly, no problems whatsoever, but it deletes the file from file manager which i want to aviod.

My item model code: 

class Item(models.Model):
    symbol = models.CharField(max_length=60)
    slug = models.SlugField(max_length=255, unique=True, help_text="Skrócona nazwa wyświetlana w adresie URL.")
    quantity = models.PositiveIntegerField(default=1, verbose_name="ilość")
    manufacturer = models.ForeignKey(Manufacturer, blank=True, null=True, verbose_name="producent")
    location = models.ForeignKey(Location, blank=True, null=True, verbose_name="lokalizacja")
    short_description = models.CharField(blank=True, max_length=60, verbose_name="skrócony opis", help_text="Opis wyświetlany na liście elementów.")
    # TODO: Zwieksz max_length powyzej, ale sprawdz czy przy max. dlugosci sie nie rozjezdzaja komorki...
    description = models.TextField(blank=True, verbose_name="opis")
    for_rent = models.BooleanField(default=False, verbose_name="tylko do wypożyczenia")
    category = TreeForeignKey(Category, blank=True, null=True, verbose_name="kategoria")
    # In case if one item could be in many categories
    # categories = TreeManyToManyField(Category, blank=True, null=True)
    # parameter = models.ForeignKey(ParameterOfItem)
    barcode = models.CharField(blank=True, max_length=16, null=True, verbose_name="kod kreskowy")
    # TODO: Render barcode on .\templates\inventory\detail.html
    created = models.DateTimeField(auto_now_add=True, verbose_name="data utworzenia")
    modified = models.DateTimeField(auto_now=True, verbose_name="data modyfikacji")
 
    def __unicode__(self):
        return self.symbol
        # return u'%s %s' % (self.manufacturer, self.symbol)
 
    class Meta:
        ordering = ['symbol']
        verbose_name = "element"
        verbose_name_plural = "elementy"

and ItemImage class:

class ItemImage(models.Model):
    image = FilerImageField(blank=True, null=True, verbose_name="obrazek")
    item = models.ForeignKey(Item)
 
    def __unicode__(self):
        return self.image.original_filename
 
    class Meta:
        verbose_name = "obrazek"
        verbose_name_plural = "obrazki"

Deleting image directly from the filer deletes the itemimage database record, but the red cross in item modification page does not. I have no idea what to do about it, any ideas?