diff --git a/media/forms.py b/media/forms.py
index 2fb16e6..cebda4a 100644
--- a/media/forms.py
+++ b/media/forms.py
@@ -34,13 +34,13 @@ class MediaAdminForm(ModelForm):
 
             # Fill the data
             # TODO implement authors, side_identifier
-            if data['title']:
+            if 'title' in data:
                 self.cleaned_data['title'] = data['title']
-            if data['subtitle']:
+            if 'subtitle' in data:
                 self.cleaned_data['subtitle'] = data['subtitle']
-            if data['url']:
+            if 'url' in data:
                 self.cleaned_data['external_url'] = data['url']
-            if data['number_of_pages']:
+            if 'number_of_pages' in data:
                 self.cleaned_data['number_of_pages'] = \
                     data['number_of_pages']