fix: check field existence before rendering

templates/booking/edit.html.twig

@@ -217,9 +217,11 @@
                                                 {% endif %}
                                             </div>
                                         {% endif %}
-                                        <div {{ stimulus_target('select-toggle--parking', 'container') }}>
-                                            {{ form_row(child.parking) }}
-                                        </div>
+                                        {% if child.parking is defined %}
+                                            <div {{ stimulus_target('select-toggle--parking', 'container') }}>
+                                                {{ form_row(child.parking) }}
+                                            </div>
+                                        {% endif %}
                                     </div>
                                     {% if not travelData.additionalServicesMutable %}
                                         <div class="absolute inset-0 cursor-not-allowed"></div>