diff --git a/web/lib/tasks/lesson.rake b/web/lib/tasks/lesson.rake
index d89bdb179..df002b9ca 100644
--- a/web/lib/tasks/lesson.rake
+++ b/web/lib/tasks/lesson.rake
@@ -5,6 +5,8 @@ begin
 require Rails.root.join('spec', 'support', 'lessons.rb')
 rescue LoadError
   puts "for production; we ignore LoadError"
+rescue TypeError
+  puts "for production, we ignore type error"
 end
 
 namespace :lessons do