X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/c73e7333d5b55808c68d4f9a39501869e7baf009..4a78635a105b43bac10f2f14a4a549f2b05c8a5c:/apps/workbench/app/controllers/application_controller.rb

diff --git a/apps/workbench/app/controllers/application_controller.rb b/apps/workbench/app/controllers/application_controller.rb
index d0496cb42a..e3f92efe23 100644
--- a/apps/workbench/app/controllers/application_controller.rb
+++ b/apps/workbench/app/controllers/application_controller.rb
@@ -728,7 +728,7 @@ class ApplicationController < ActionController::Base
   def get_n_objects_of_class dataclass, size
     @objects_map_for ||= {}
 
-    raise ArgumentError, 'Argument is not a data class' unless dataclass.is_a? Class
+    raise ArgumentError, 'Argument is not a data class' unless dataclass.is_a? Class and dataclass < ArvadosBase
     raise ArgumentError, 'Argument is not a valid limit size' unless (size && size>0)
 
     # if the objects_map_for has a value for this dataclass, and the