diff --git a/forum/views.py b/forum/views.py
index 11ab52ad..9a2f443b 100644
--- a/forum/views.py
+++ b/forum/views.py
@@ -42,6 +42,7 @@ from core.views import (
     CanEditMixin,
     CanEditPropMixin,
     CanCreateMixin,
+    UserIsLoggedMixin,
     can_view,
 )
 from core.views.forms import MarkdownInput
@@ -273,7 +274,9 @@ class ForumTopicEditView(CanEditMixin, UpdateView):
     template_name = "core/edit.jinja"
 
 
-class ForumTopicSubscribeView(CanViewMixin, SingleObjectMixin, RedirectView):
+class ForumTopicSubscribeView(
+    CanViewMixin, UserIsLoggedMixin, SingleObjectMixin, RedirectView
+):
     model = ForumTopic
     pk_url_kwarg = "topic_id"
     permanent = False
diff --git a/sas/views.py b/sas/views.py
index 941e2bb6..a43369e4 100644
--- a/sas/views.py
+++ b/sas/views.py
@@ -180,6 +180,12 @@ class PictureView(CanViewMixin, DetailView, FormMixin):
             if self.form.is_valid():
                 for uid in self.form.cleaned_data["users"]:
                     u = User.objects.filter(id=uid).first()
+                    if not u:  # Don't use a non existing user
+                        continue
+                    if PeoplePictureRelation.objects.filter(
+                        user=u, picture=self.form.cleaned_data["picture"]
+                    ).exists():  # Avoid existing relation
+                        continue
                     PeoplePictureRelation(
                         user=u, picture=self.form.cleaned_data["picture"]
                     ).save()