diff --git a/app/models/comment.rb b/app/models/comment.rb
index 70a36562f..ec916ccc3 100644
--- a/app/models/comment.rb
+++ b/app/models/comment.rb
@@ -25,7 +25,7 @@ class Comment < ApplicationRecord
 
   private
     def card_is_commentable
-      errors.add(:card, "does not allow comments") unless card.commentable?
+      errors.add(:card, "does not allow comments") unless card&.commentable?
     end
 
     def watch_card_by_creator