diff --git a/src/core/Resources/views/form/bootstrap_4_form_theme.html.twig b/src/core/Resources/views/form/bootstrap_4_form_theme.html.twig
index fc86bb8..8690d63 100644
--- a/src/core/Resources/views/form/bootstrap_4_form_theme.html.twig
+++ b/src/core/Resources/views/form/bootstrap_4_form_theme.html.twig
@@ -2,9 +2,14 @@
 
 {% block builder_widget %}
     {% set row_attr = row_attr|merge({class: 'builder-widget ' ~ (row_attr.class ?? '')}) %}
+    {% set value = value is iterable ? value|json_encode : value %}
+
+    {% if value == '' %}
+        {% set value = '[]' %}
+    {% endif %}
 
     <div {% for attr, value in row_attr %}{{ attr }}="{{ value }}" {% endfor %}>
-        <div class="builder-widget-component" data-value="{{ value is iterable ? value|json_encode : value }}" data-name="{{ full_name }}" data-id="{{ id }}">
+        <div class="builder-widget-component" data-value="{{ value }}" data-name="{{ full_name }}" data-id="{{ id }}">
         </div>
     </div>
 {% endblock %}