Exception handling, if current item is removed from parent view by user action

views/__init__.py

 from users.forms import UserProfileFormLanguageOnly
 from .userviews import get_wrapper_instance as get_userview_wrapper_instance
 import zipfile
-from pygal.views.userviews import query_view
+from pygal.views.userviews import query_view, ItemDoesNotEsistWithinParent
 
 
 def pygal_item_does_not_exist(request, context):
     #
     if w.may_read():
         context.set_additional_title(w.name)
-        return w.render(context)
+        try:
+            return w.render(context)
+        except ItemDoesNotEsistWithinParent:
+            return redirect('?'.join([request.META['PATH_INFO'].replace(rel_path, ''), request.META['QUERY_STRING']]))
     else:
         return pygal_access_denied(request, context)
 
         tag_context_adaption(context, w, request, get_item_type(full_path) in [TYPE_IMAGE])
         if request.POST:
             tag = Tag(item=w.item)
-            form = TagForm(request.POST, instance=tag, factor_to_original=context['factor_to_original'])
+            form = TagForm(request.POST, instance=tag, factor_to_original=context.get('factor_to_original'))
             if form.is_valid():
                 form.save()
                 messages.info(request, _('Thanks for adding a Tag to %s') % w.name)
         context['enable_delete_button'] = True
         if request.POST:
             if request.POST.get('save'):
-                form = TagForm(request.POST, instance=t, factor_to_original=context['factor_to_original'])
+                form = TagForm(request.POST, instance=t, factor_to_original=context.get('factor_to_original'))
                 if form.is_valid():
                     form.save()
                     messages.info(request, _('Thanks for editing Tag %(tag_id)d to %(item_name)s') % {'tag_id': tag_id, 'item_name': w.name})
                 messages.info(request, _('Tag %(tag_id)d of %(item_name)s has been deleted.') % {'tag_id': tag_id, 'item_name': w.name})
                 return redirect(get_next(request))
         else:
-            form = TagForm(instance=t, factor_to_original=context['factor_to_original'])
+            form = TagForm(instance=t, factor_to_original=context.get('factor_to_original'))
         context['form'] = form
         return render(request, 'pygal/tagedit.html', context=context)
 

views/userviews.py

 SHUFFLE_ENTRY = 'shuffle-main'
 
 
+class ItemDoesNotEsistWithinParent(Exception):
+    pass
+
+
 def get_wrapper_class(full_path):
     return {
         TYPE_FOLDER: folder_view,
         if direction not in [-1, 1]:
             raise ValueError("Parameter direction is incorrect: %s" % repr(direction))
         fp_il = random_copy(self.request, self.__parent__().sorted_fullpathlist())
-        i = fp_il.index(self.full_path)
+        try:
+            i = fp_il.index(self.full_path)
+        except ValueError as e:
+            raise ItemDoesNotEsistWithinParent(e)
         lgt = len(fp_il)
         for i in range(i + direction, i + direction * lgt, direction):
             full_path = fp_il[i % lgt]