diff --git a/app/controllers/concerns/lti.rb b/app/controllers/concerns/lti.rb
index 53066ae0..6437b731 100644
--- a/app/controllers/concerns/lti.rb
+++ b/app/controllers/concerns/lti.rb
@@ -226,7 +226,7 @@ module Lti
     @lti_parameters.save!
 
     session[:external_user_id] = current_user.id
-  rescue ActiveRecord::RecordNotUnique
+  rescue ActiveRecord::RecordNotUnique, ActiveRecord::RecordInvalid
     retry
   end