diff --git a/app/views/admin/activities/show.html.haml b/app/views/admin/activities/show.html.haml
index a34a8050f..ba3e35de1 100644
--- a/app/views/admin/activities/show.html.haml
+++ b/app/views/admin/activities/show.html.haml
@@ -26,7 +26,7 @@
                 = I18n.t('editing.copy') + '📋'
             -# add a button to add all committee members to the activity
             -# TODO make sure works if no group
-            - if @activity.group.committee?
+            - if defined?(@activity.group.committee?)
               %button.btn.btn-info#btn-add-committee{ :style => 'margin-left: 8px;' , :data => { 'id' => @activity.id,  } }
                 = 'add ' + @activity.group.name + ' ➕'