diff --git a/app/models/prefill_params.rb b/app/models/prefill_params.rb
index 6f16c1e2e..335cd005b 100644
--- a/app/models/prefill_params.rb
+++ b/app/models/prefill_params.rb
@@ -75,6 +75,8 @@ class PrefillParams
     end
 
     def repeatable_hashes
+      return [] unless value.is_a?(Array)
+
       value.map.with_index do |repetition, index|
         row = champ.rows[index] || champ.add_row(champ.dossier_revision)
         JSON.parse(repetition).map do |key, value|
diff --git a/spec/models/types_de_champ/prefill_type_de_champ_spec.rb b/spec/models/types_de_champ/prefill_type_de_champ_spec.rb
index af0e3cfc9..f75fc8f1b 100644
--- a/spec/models/types_de_champ/prefill_type_de_champ_spec.rb
+++ b/spec/models/types_de_champ/prefill_type_de_champ_spec.rb
@@ -50,7 +50,7 @@ RSpec.describe TypesDeChamp::PrefillTypeDeChamp, type: :model do
     context 'when the type de champ is prefillable' do
       let(:type_de_champ) { build(:type_de_champ_email) }
 
-      it { expect(possible_values).to match([]) }
+      it { expect(possible_values).to match(["Une adresse email"]) }
     end
   end