diff --git a/app/models/concerns/dossier_prefillable_concern.rb b/app/models/concerns/dossier_prefillable_concern.rb
index 1b716c6b2..bbcfdc8e1 100644
--- a/app/models/concerns/dossier_prefillable_concern.rb
+++ b/app/models/concerns/dossier_prefillable_concern.rb
@@ -8,7 +8,7 @@ module DossierPrefillableConcern
 
     attributes = { prefilled: true }
     attributes[:champs_attributes] = champs_attributes.map { |h| h.merge(prefilled: true) }
-    attributes[:individual_attributes] = identity_attributes
+    attributes[:individual_attributes] = identity_attributes if identity_attributes.present?
 
     assign_attributes(attributes)
     save(validate: false)
diff --git a/lib/tasks/deployment/20230918143300_fix_prefilled_empty_individual.rake b/lib/tasks/deployment/20230918143300_fix_prefilled_empty_individual.rake
new file mode 100644
index 000000000..68f570f95
--- /dev/null
+++ b/lib/tasks/deployment/20230918143300_fix_prefilled_empty_individual.rake
@@ -0,0 +1,16 @@
+namespace :after_party do
+  desc 'Deployment task: fix_prefilled_empty_individual'
+  task fix_prefilled_empty_individual: :environment do
+    puts "Running deploy task 'fix_prefilled_empty_individual'"
+
+    Dossier.prefilled.joins(:procedure).joins(:individual).where(procedure: { for_individual: false }).find_each do |dossier|
+      rake_puts "Destroy Individual of dossier ##{dossier.id}"
+      dossier.individual.destroy!
+    end
+
+    # Update task as completed.  If you remove the line below, the task will
+    # run with every deploy (or every time you call after_party:run).
+    AfterParty::TaskRecord
+      .create version: AfterParty::TaskRecorder.new(__FILE__).timestamp
+  end
+end
diff --git a/spec/models/concern/dossier_prefillable_concern_spec.rb b/spec/models/concern/dossier_prefillable_concern_spec.rb
index a2e680368..680688900 100644
--- a/spec/models/concern/dossier_prefillable_concern_spec.rb
+++ b/spec/models/concern/dossier_prefillable_concern_spec.rb
@@ -101,6 +101,29 @@ RSpec.describe DossierPrefillableConcern do
       end
     end
 
+    context "when dossier is for etablissement" do
+      let(:procedure) { create(:procedure, :published, types_de_champ_public:, types_de_champ_private:) }
+      let(:dossier) { create(:dossier, :brouillon, procedure: procedure) }
+
+      context 'when champs_attributes has values' do
+        context 'when the champs are valid' do
+          let(:types_de_champ_public) { [{ type: :text }] }
+          let(:type_de_champ_1) { procedure.published_revision.types_de_champ_public.first }
+          let(:value_1) { "any value" }
+          let(:champ_id_1) { find_champ_by_stable_id(dossier, type_de_champ_1.stable_id).id }
+          let(:values) { [{ id: champ_id_1, value: value_1 }] }
+
+          it "updates the champs with the new values and mark them as prefilled" do
+            fill
+            expect(dossier.champs_public.first.value).to eq(value_1)
+            expect(dossier.individual).to be_nil # Fix #9486
+          end
+
+          it_behaves_like 'a dossier marked as prefilled'
+        end
+      end
+    end
+
     private
 
     def find_champ_by_stable_id(dossier, stable_id)