diff --git a/app/transactions/hyrax/transactions/iiif_print_container_decorator.rb b/app/transactions/hyrax/transactions/iiif_print_container_decorator.rb
index 18a9999a..09ff253e 100644
--- a/app/transactions/hyrax/transactions/iiif_print_container_decorator.rb
+++ b/app/transactions/hyrax/transactions/iiif_print_container_decorator.rb
@@ -31,15 +31,19 @@ class IiifPrintContainerDecorator
       namespace 'change_set' do |ops|
         ops.register 'update_work' do
           steps = Hyrax::Transactions::WorkUpdate::DEFAULT_STEPS.dup
+          # NOTE: applications that don't want the file splitting of IIIF Print will want to remove
+          # this step from their transactions.
           steps.insert(steps.index('work_resource.update_work_members') + 1, 'work_resource.set_child_flag')
           Hyrax::Transactions::WorkUpdate.new(steps: steps)
         end
       end
 
-      if defined?(Bulkrax::Container)
+      if defined?(Bulkrax::Transactions::Container)
         namespace 'work_resource' do |ops|
-          ops.register Bulkrax::Container::UPDATE_WITH_BULK_BEHAVIOR do
-            steps = Bulkrax::Container::UPDATE_WITH_BULK_BEHAVIOR_STEPS.dup
+          ops.register Bulkrax::Transactions::Container::UPDATE_WITH_BULK_BEHAVIOR do
+            steps = Bulkrax::Transactions::Container::UPDATE_WITH_BULK_BEHAVIOR_STEPS.dup
+            # NOTE: applications that don't want the file splitting of IIIF Print will want to remove
+            # this step from their transactions.
             steps.insert(steps.index('work_resource.update_work_members') + 1, 'work_resource.set_child_flag')
             Hyrax::Transactions::WorkUpdate.new(steps: steps)
           end
diff --git a/app/transactions/hyrax/transactions/steps/set_child_flag.rb b/app/transactions/hyrax/transactions/steps/set_child_flag.rb
index c4851e52..89d85272 100644
--- a/app/transactions/hyrax/transactions/steps/set_child_flag.rb
+++ b/app/transactions/hyrax/transactions/steps/set_child_flag.rb
@@ -6,12 +6,18 @@ module Steps
       class SetChildFlag
         include Dry::Monads[:result]
 
+        # @see IiifPrint.model_configuration
         def call(resource)
           return Failure(:resource_not_persisted) unless resource.persisted?
 
           user = ::User.find_by_user_key(resource.depositor)
 
           Hyrax.custom_queries.find_child_works(resource: resource).each do |child_work|
+            # not all child works might have the is_child property that we define when we configure
+            # the a model for iiif_print.  see IiifPrint.model_configuration
+            #
+            # Put another the existence of the is_child property is optional.
+            next unless child_work.respond_to?(:is_child)
             next if child_work.is_child
             child_work.is_child = true
             Hyrax.persister.save(resource: child_work)