trying to fix initial messages loading

aggregator/forms.py

@@ -17,14 +17,16 @@ class AggregationSourceForm(ModelForm):
         cleaned_data = super(AggregationSourceForm, self).clean()
         invite_link = cleaned_data.pop('invite_link')
         if invite_link:
-            with get_client() as app:
+            app = get_client()
+            app.start()
             try:
                 upd = app.join_chat(invite_link)
+            except ChannelPrivate:
+                raise ValidationError('I was banned in this chat')
+            app.stop()
             chat = parse_mtproto_chat(app, upd.chats[0])
             cleaned_data['chat_id'] = chat.id
             Chat.from_obj(chat, app)
-                except ChannelPrivate:
-                    raise ValidationError('I was banned in this chat')
         return cleaned_data
 
     class Meta: