diff --git a/app/models/messenger.rb b/app/models/messenger.rb
index 97fba45..09e62f8 100644
--- a/app/models/messenger.rb
+++ b/app/models/messenger.rb
@@ -240,7 +240,7 @@ class Messenger
       when 'fixed_version'
         value = object_field_value Version, detail.value
       when 'attachment'
-        attachment = Attachment.find(detail.prop_key)
+        attachment = Attachment.find_by id: detail.prop_key
         value = if attachment.present?
                   escape = false
                   "<#{object_url attachment}|#{markup_format attachment.filename}>"