this is stacktrace when I use: slug = AutoSlugField(populate_from='name')
in my model


Environment:


Request Method: POST
Request URL: http://127.0.0.1:8000/admin/product/shop/add/

Django Version: 1.7.1
Python Version: 3.4.2
Installed Applications:
('django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'product')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware')


Traceback:
File "e:\python\lib\site-packages\django\core\handlers\base.py" in
get_response
  111.                     response = wrapped_callback(request,
*callback_args, **callback_kwargs)
File "e:\python\lib\site-packages\django\contrib\admin\options.py" in
wrapper
  584.                 return self.admin_site.admin_view(view)(*args,
**kwargs)
File "e:\python\lib\site-packages\django\utils\decorators.py" in
_wrapped_view
  105.                     response = view_func(request, *args, **kwargs)
File "e:\python\lib\site-packages\django\views\decorators\cache.py" in
_wrapped_view_func
  52.         response = view_func(request, *args, **kwargs)
File "e:\python\lib\site-packages\django\contrib\admin\sites.py" in inner
  204.             return view(request, *args, **kwargs)
File "e:\python\lib\site-packages\django\contrib\admin\options.py" in
add_view
  1454.         return self.changeform_view(request, None, form_url,
extra_context)
File "e:\python\lib\site-packages\django\utils\decorators.py" in _wrapper
  29.             return bound_func(*args, **kwargs)
File "e:\python\lib\site-packages\django\utils\decorators.py" in
_wrapped_view
  105.                     response = view_func(request, *args, **kwargs)
File "e:\python\lib\site-packages\django\utils\decorators.py" in bound_func
  25.                 return func.__get__(self, type(self))(*args2,
**kwargs2)
File "e:\python\lib\site-packages\django\db\transaction.py" in inner
  394.                 return func(*args, **kwargs)
File "e:\python\lib\site-packages\django\contrib\admin\options.py" in
changeform_view
  1405.                 self.save_model(request, new_object, form, not add)
File "e:\python\lib\site-packages\django\contrib\admin\options.py" in
save_model
  1046.         obj.save()
File "e:\python\lib\site-packages\django\db\models\base.py" in save
  591.                        force_update=force_update,
update_fields=update_fields)
File "e:\python\lib\site-packages\django\db\models\base.py" in save_base
  619.             updated = self._save_table(raw, cls, force_insert,
force_update, using, update_fields)
File "e:\python\lib\site-packages\django\db\models\base.py" in _save_table
  700.             result = self._do_insert(cls._base_manager, using,
fields, update_pk, raw)
File "e:\python\lib\site-packages\django\db\models\base.py" in _do_insert
  733.                                using=using, raw=raw)
File "e:\python\lib\site-packages\django\db\models\manager.py" in
manager_method
  92.                 return getattr(self.get_queryset(), name)(*args,
**kwargs)
File "e:\python\lib\site-packages\django\db\models\query.py" in _insert
  921.         return query.get_compiler(using=using).execute_sql(return_id)
File "e:\python\lib\site-packages\django\db\models\sql\compiler.py" in
execute_sql
  920.                 cursor.execute(sql, params)
File "e:\python\lib\site-packages\django\db\backends\utils.py" in execute
  85.             sql = self.db.ops.last_executed_query(self.cursor, sql,
params)
File "e:\python\lib\site-packages\mysql\connector\django\base.py" in
last_executed_query
  371.         return cursor.statement
File "e:\python\lib\site-packages\mysql\connector\django\base.py" in
__getattr__
  147.         return getattr(self.cursor, attr)
File "e:\python\lib\site-packages\mysql\connector\cursor.py" in statement
  858.             return self._executed.strip()

Exception Type: AttributeError at /admin/product/shop/add/
Exception Value: 'NoneType' object has no attribute 'strip'

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