Produits Entr'ouvert » Authentic 2

If I'm not logged in, I go to /admin, I authenticate with my ldap account, I have access, no problem.
If I'm logged in with a "standard" user, I go to /admin, I authenticate with my ldap account, the problem occurs.

Tested on the 3M dev.

Environment:

Request Method: GET
Request URL: https://idp-montpellier.dev.entrouvert.org/admin/

Django Version: 1.7.7
Python Version: 2.7.3
Installed Applications:
''
Installed Middleware:
''

Template error:
In template /usr/lib/python2.7/dist-packages/admin_tools/theming/templates/admin/base.html, error at line 39
   block
   29 :         <div id="user-tools">

   30 :             {% block welcome-msg %}

   31 :                 {% trans 'Welcome,' %}

   32 :                 <strong>{% firstof user.get_short_name user.get_username %}</strong>.

   33 :             {% endblock %}

   34 :             {% block userlinks %}

   35 :                 {% url 'django-admindocs-docroot' as docsroot %}

   36 :                 {% if docsroot %}

   37 :                     <a href="{{ docsroot }}">{% trans 'Documentation' %}</a> /

   38 :                 {% endif %}

   39 :                  {% if user.has_usable_password %} 

   40 :                 <a href="{% url 'admin:password_change' %}">{% trans 'Change password' %}</a> /

   41 :                 {% endif %}

   42 :                 <a href="{% url 'admin:logout' %}">{% trans 'Log out' %}</a>

   43 :             {% endblock %}

   44 :         </div>

   45 :         {% endif %}

   46 :         {% block nav-global %}{% endblock %}

   47 :     </div>

   48 :     <!-- END Header -->

   49 :     {% block breadcrumbs %}

Traceback:
File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response
  137.                 response = response.render()
File "/usr/lib/python2.7/dist-packages/django/template/response.py" in render
  103.             self.content = self.rendered_content
File "/usr/lib/python2.7/dist-packages/django/template/response.py" in rendered_content
  80.         content = template.render(context)
File "/usr/lib/python2.7/dist-packages/django/template/base.py" in render
  148.             return self._render(context)
File "/usr/lib/python2.7/dist-packages/django/template/base.py" in _render
  142.         return self.nodelist.render(context)
File "/usr/lib/python2.7/dist-packages/django/template/base.py" in render
  844.                 bit = self.render_node(node, context)
File "/usr/lib/python2.7/dist-packages/django/template/debug.py" in render_node
  80.             return node.render(context)
File "/usr/lib/python2.7/dist-packages/django/template/loader_tags.py" in render
  126.         return compiled_parent._render(context)
File "/usr/lib/python2.7/dist-packages/django/template/base.py" in _render
  142.         return self.nodelist.render(context)
File "/usr/lib/python2.7/dist-packages/django/template/base.py" in render
  844.                 bit = self.render_node(node, context)
File "/usr/lib/python2.7/dist-packages/django/template/debug.py" in render_node
  80.             return node.render(context)
File "/usr/lib/python2.7/dist-packages/django/template/loader_tags.py" in render
  126.         return compiled_parent._render(context)
File "/usr/lib/python2.7/dist-packages/django/template/base.py" in _render
  142.         return self.nodelist.render(context)
File "/usr/lib/python2.7/dist-packages/django/template/base.py" in render
  844.                 bit = self.render_node(node, context)
File "/usr/lib/python2.7/dist-packages/django/template/debug.py" in render_node
  80.             return node.render(context)
File "/usr/lib/python2.7/dist-packages/django/template/defaulttags.py" in render
  312.                 return nodelist.render(context)
File "/usr/lib/python2.7/dist-packages/django/template/base.py" in render
  844.                 bit = self.render_node(node, context)
File "/usr/lib/python2.7/dist-packages/django/template/debug.py" in render_node
  80.             return node.render(context)
File "/usr/lib/python2.7/dist-packages/django/template/defaulttags.py" in render
  312.                 return nodelist.render(context)
File "/usr/lib/python2.7/dist-packages/django/template/base.py" in render
  844.                 bit = self.render_node(node, context)
File "/usr/lib/python2.7/dist-packages/django/template/debug.py" in render_node
  80.             return node.render(context)
File "/usr/lib/python2.7/dist-packages/django/template/loader_tags.py" in render
  65.                 result = block.nodelist.render(context)
File "/usr/lib/python2.7/dist-packages/django/template/base.py" in render
  844.                 bit = self.render_node(node, context)
File "/usr/lib/python2.7/dist-packages/django/template/debug.py" in render_node
  80.             return node.render(context)
File "/usr/lib/python2.7/dist-packages/django/template/defaulttags.py" in render
  305.                     match = condition.eval(context)
File "/usr/lib/python2.7/dist-packages/django/template/defaulttags.py" in eval
  898.         return self.value.resolve(context, ignore_failures=True)
File "/usr/lib/python2.7/dist-packages/django/template/base.py" in resolve
  596.                 obj = self.var.resolve(context)
File "/usr/lib/python2.7/dist-packages/django/template/base.py" in resolve
  734.             value = self._resolve_lookup(context)
File "/usr/lib/python2.7/dist-packages/django/template/base.py" in _resolve_lookup
  788.                             current = current()
File "/usr/lib/python2.7/dist-packages/authentic2/backends/ldap_backend.py" in has_usable_password
  163.         return self.block['user_can_change_password']
File "/usr/lib/python2.7/dist-packages/authentic2/backends/ldap_backend.py" in block
  63.         return self.ldap_data['block']

Exception Type: KeyError at /admin/
Exception Value: 'block'