diff --git a/app/models/doi.rb b/app/models/doi.rb
index e48206770..c23628c87 100644
--- a/app/models/doi.rb
+++ b/app/models/doi.rb
@@ -1838,7 +1838,7 @@ def event=(value)
   end
 
   def check_url
-    return nil if doi.is_registered_or_findable?
+    return nil if is_registered_or_findable?
 
     unless match_url_with_domains(url: url, domains: client.domains)
       errors.add(:url, "URL is not allowed by repository domain settings.")