diff --git a/app/models/ticket/article/assets.rb b/app/models/ticket/article/assets.rb
index 78848ef28..9a6cc9dd1 100644
--- a/app/models/ticket/article/assets.rb
+++ b/app/models/ticket/article/assets.rb
@@ -33,7 +33,9 @@ returns
     end
     if !data[ app_model_ticket ][ ticket_id ]
       ticket = Ticket.lookup(id: ticket_id)
-      data = ticket.assets(data)
+      if ticket
+        data = ticket.assets(data)
+      end
     end
 
     if !data[ app_model_article ]
diff --git a/app/models/user/assets.rb b/app/models/user/assets.rb
index 706b609c6..f7436c7c2 100644
--- a/app/models/user/assets.rb
+++ b/app/models/user/assets.rb
@@ -61,6 +61,8 @@ returns
           next if data[:Role] && data[:Role][role_id]
 
           role = Role.lookup(id: role_id)
+          next if !role
+
           data = role.assets(data)
         end