diff --git a/themis/importexport/sync.py b/themis/importexport/sync.py
index 84df881..284a9ee 100644
--- a/themis/importexport/sync.py
+++ b/themis/importexport/sync.py
@@ -125,6 +125,8 @@ class SyncFromThemis(UtilityView):
             if data.get('picture'):
                 # this will be an url
                 content = self.urlopen(data.get('picture')).read()
+                if not hasattr(object, 'picture'):
+                    object.picture = None
                 if object.picture is None or object.picture.data != content:
                     object.picture = NamedBlobImage(content, filename=data.get('id'))
             if data.get('past_functions'):
@@ -240,10 +242,14 @@ class SyncFromThemis(UtilityView):
                 object.session = data.get('session')
             if data.get('fichier'):
                 content = self.urlopen(data.get('fichier')).read()
+                if not hasattr(object, 'file'):
+                    object.file = None
                 if object.file is None or object.file.data != content:
                     object.file = NamedBlobFile(content, filename=data.get('id')+'.pdf')
             if data.get('document_imprime'):
                 content = self.urlopen(data.get('document_imprime')).read()
+                if not hasattr(object, 'file'):
+                    object.file = None
                 if object.file is None or object.file.data != content:
                     object.file = NamedBlobFile(content, filename=data.get('id')+'.pdf')
             if data.get('object_type'):