Fix #1529

app/models/education/program/with_diploma.rb

@@ -6,4 +6,10 @@ module Education::Program::WithDiploma
       class_name: 'Education::Diploma',
       optional: true
   end
+
+  # Used by website 
+  # https://github.com/noesya/osuny/issues/1529
+  def diplomas
+    [diploma]
+  end
 end