diff --git a/boards/abstracts/settingsmanager.py b/boards/abstracts/settingsmanager.py
--- a/boards/abstracts/settingsmanager.py
+++ b/boards/abstracts/settingsmanager.py
@@ -168,7 +168,10 @@ class SettingsManager:
     def get_attachment_by_alias(self, alias):
         images = self.get_setting(SETTING_IMAGES)
         if images and alias in images:
-            return Attachment.objects.get(id=images.get(alias))
+            try:
+                return Attachment.objects.get(id=images.get(alias))
+            except Attachment.DoesNotExist:
+                self.remove_attachment_alias(alias)
 
     def add_attachment_alias(self, alias, attachment):
         images = self.get_setting(SETTING_IMAGES)
@@ -184,10 +187,15 @@ class SettingsManager:
 
     def get_stickers(self):
         images = self.get_setting(SETTING_IMAGES)
+        stickers = []
         if images:
-            return [AttachmentSticker(name=key,
-                                      attachment=Attachment.objects.get(id=value))
-                    for key, value in images.items()]
+            for key, value in images.items():
+                try:
+                    attachment = Attachment.objects.get(id=value)
+                    stickers.append(AttachmentSticker(name=key, attachment=attachment))
+                except Attachment.DoesNotExist:
+                    self.remove_attachment_alias(key)
+        return stickers
 
 
 class SessionSettingsManager(SettingsManager):