diff --git a/lib/iev/termbase/relaton_db.rb b/lib/iev/termbase/relaton_db.rb
index f3dd357..09c8a95 100644
--- a/lib/iev/termbase/relaton_db.rb
+++ b/lib/iev/termbase/relaton_db.rb
@@ -20,6 +20,18 @@ def initialize
       # @param code [String] reference
       # @return [RelatonIso::IsoBibliongraphicItem]
       def fetch(code)
+        relaton_item = fetch!(code)
+
+        if relaton_item.nil?
+          debug(:relaton, "Could not fetch authorative source '#{code}'.")
+        end
+
+        relaton_item
+      end
+
+      private
+
+      def fetch!(code)
         retrying_on_failures do
           capture_output_streams do
             @db.fetch code
@@ -27,8 +39,6 @@ def fetch(code)
         end
       end
 
-      private
-
       def retrying_on_failures(attempts: 4)
         curr_attempt = 1