diff --git a/openslides/account/views.py b/openslides/account/views.py
index a3b9c47e9..5fa151665 100644
--- a/openslides/account/views.py
+++ b/openslides/account/views.py
@@ -11,6 +11,7 @@
 """
 
 from django.utils.translation import ugettext as _
+from django.contrib.auth.models import AnonymousUser
 
 from openslides.config.api import config
 from openslides.projector.projector import Widget
@@ -20,7 +21,10 @@ def get_widgets(request):
     """
     Returns the widgets of the account app. It is only a personal_info_widget.
     """
-    return [get_personal_info_widget(request)]
+    if not isinstance(request.user, AnonymousUser):
+        return [get_personal_info_widget(request)]
+    else:
+        return []
 
 
 def get_personal_info_widget(request):
diff --git a/openslides/agenda/templates/agenda/view.html b/openslides/agenda/templates/agenda/view.html
index 400f2542e..33bb9f18a 100644
--- a/openslides/agenda/templates/agenda/view.html
+++ b/openslides/agenda/templates/agenda/view.html
@@ -151,11 +151,11 @@
     </ul>
 
     <p>
-    {% if is_speaker %}
-        <a href="{% url 'agenda_speaker_delete' object.id %}" class="btn">{% trans "Remove me from the list" %}</a>
-    {% elif not object.speaker_list_closed %}
-        <a href="{% url 'agenda_speaker_append' object.id %}" class="btn">{% trans "Put me on the list" %}</a>
-    {% endif %}
+        {% if is_speaker %}
+            <a href="{% url 'agenda_speaker_delete' object.id %}" class="btn">{% trans "Remove me from the list" %}</a>
+        {% elif not object.speaker_list_closed and perms.can_be_speaker %}
+            <a href="{% url 'agenda_speaker_append' object.id %}" class="btn">{% trans "Put me on the list" %}</a>
+        {% endif %}
     </p>
 
     {% if perms.can_manage_agenda %}
diff --git a/openslides/utils/person/models.py b/openslides/utils/person/models.py
index f4beadd05..c56c1e6a2 100644
--- a/openslides/utils/person/models.py
+++ b/openslides/utils/person/models.py
@@ -11,6 +11,8 @@
 """
 from django.db import models
 
+from openslides.utils.exceptions import OpenSlidesError
+
 from .forms import PersonFormField
 from .api import get_person, generate_person_id
 
@@ -41,11 +43,16 @@ class PersonField(models.fields.Field):
         Convert a person object to a string, to store it in the database.
         """
         if value is None:
+            # For Fields with null=True
             return None
         elif isinstance(value, basestring):
+            # The object is already a a person_id
             return value
-        else:
+        elif hasattr(value, 'person_id'):
+            # The object is a person
             return value.person_id
+        else:
+            OpenSlidesError('%s (%s) is no person' % (value, type(value)))
 
     def formfield(self, **kwargs):
         defaults = {'form_class': PersonFormField}