diff --git a/templates/Parts/lists/_action_bar.html.twig b/templates/Parts/lists/_action_bar.html.twig
index 59a71b64..3db2bd94 100644
--- a/templates/Parts/lists/_action_bar.html.twig
+++ b/templates/Parts/lists/_action_bar.html.twig
@@ -1,6 +1,6 @@
 <div class="row mb-3">
     <div class="col">
-        <a href="{{ url('part_new', url_options) }}" class="btn btn-success float-left {% if not is_granted("@parts.create") or entity.notSelectable %}disabled{% endif %}"><i class="fas fa-plus-square fa-fw"></i>
+        <a href="{{ url('part_new', url_options) }}" class="btn btn-success float-left {% if not is_granted("@parts.create") or (entity is defined and entity.notSelectable) %}disabled{% endif %}"><i class="fas fa-plus-square fa-fw"></i>
             {% trans%}part.create.btn{% endtrans %}</a>
     </div>
 </div>
\ No newline at end of file