diff --git a/backend/app/services/certified_tag_name_translations.rb b/backend/app/services/certified_tag_name_translations.rb
index c0e6121..751938a 100644
--- a/backend/app/services/certified_tag_name_translations.rb
+++ b/backend/app/services/certified_tag_name_translations.rb
@@ -85,6 +85,8 @@ class CertifiedTagNameTranslations
     translations = {}
     entries.each do |source, target|
       rows = matches.fetch(source, [])
+      next if rows.empty?
+
       unless rows.length == 1
         fail!("source primary name #{ source.inspect } must match exactly one tag")
       end