diff --git a/src/fellchensammlung/models.py b/src/fellchensammlung/models.py
index e05511b..adf67c0 100644
--- a/src/fellchensammlung/models.py
+++ b/src/fellchensammlung/models.py
@@ -707,7 +707,7 @@ class Log(models.Model):
     """
     Basic class that allows logging random entries for later inspection
     """
-    user = models.ForeignKey(User, on_delete=models.CASCADE, verbose_name=_("Nutzer*in"))
+    user = models.ForeignKey(User, on_delete=models.CASCADE, verbose_name=_("Nutzer*in"), blank=True, null=True)
     action = models.CharField(max_length=255, verbose_name=_("Aktion"))
     text = models.CharField(max_length=1000, verbose_name=_("Log text"))
     created_at = models.DateTimeField(auto_now_add=True)
diff --git a/src/fellchensammlung/tools/admin.py b/src/fellchensammlung/tools/admin.py
index 349db8f..a820dd0 100644
--- a/src/fellchensammlung/tools/admin.py
+++ b/src/fellchensammlung/tools/admin.py
@@ -1,7 +1,10 @@
+import logging
+
 from django.utils import timezone
 from datetime import timedelta
 
-from fellchensammlung.models import AdoptionNotice, Location, RescueOrganization, AdoptionNoticeStatus
+from fellchensammlung.models import AdoptionNotice, Location, RescueOrganization, AdoptionNoticeStatus, Log
+from fellchensammlung.tools.misc import is_404
 
 
 def clean_locations(quiet=True):
@@ -60,6 +63,22 @@ def get_unchecked_adoption_notices(weeks=3):
     return active_unchecked_adoptions
 
 
+def get_active_adoption_notices():
+    ans = AdoptionNotice.objects.all()
+    active_adoptions = [adoption for adoption in ans if adoption.is_active]
+    return active_adoptions
+
+
 def deactivate_unchecked_adoption_notices():
     for adoption_notice in get_unchecked_adoption_notices(weeks=3):
         AdoptionNoticeStatus.objects.get(adoption_notice=adoption_notice).set_unchecked()
+
+
+def deactivate_404_adoption_notices():
+    for adoption_notice in get_active_adoption_notices():
+        if adoption_notice.link_to_more_information != "":
+            if is_404(adoption_notice.link_to_more_information):
+                adoption_notice.set_closed()
+                logging_msg = f"Automatically set Adoption Notice {adoption_notice.id} closed as link to more information returened 404"
+                logging.info(logging_msg)
+                Log.objects.create(action="automated", text=logging_msg)
diff --git a/src/notfellchen/__init__.py b/src/notfellchen/__init__.py
index 6658f36..14cb709 100644
--- a/src/notfellchen/__init__.py
+++ b/src/notfellchen/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "0.3.0"
+__version__ = "0.3.1"
 
 # This will make sure the app is always imported when
 # Django starts so that shared_task will use this app.