diff --git a/src/pretix/plugins/sendmail/templates/pretixplugins/sendmail/rule_inspect.html b/src/pretix/plugins/sendmail/templates/pretixplugins/sendmail/rule_inspect.html
index b9b62fb5f7..d83bd27043 100644
--- a/src/pretix/plugins/sendmail/templates/pretixplugins/sendmail/rule_inspect.html
+++ b/src/pretix/plugins/sendmail/templates/pretixplugins/sendmail/rule_inspect.html
@@ -44,10 +44,14 @@
                     </td>
                     {% if request.event.has_subevents %}
                         <td>
-                            <a href="{% url "control:event.subevent" organizer=request.event.organizer.slug event=request.event.slug subevent=sm.subevent.id %}?returnto={{ request.GET.urlencode|urlencode }}">
-                                {{ sm.subevent.name }}
-                            </a><br>
-                            {{ sm.subevent.get_date_range_display }}
+                            {% if sm.subevent %}
+                                <a href="{% url "control:event.subevent" organizer=request.event.organizer.slug event=request.event.slug subevent=sm.subevent.id %}?returnto={{ request.GET.urlencode|urlencode }}">
+                                    {{ sm.subevent.name }}
+                                </a><br>
+                                {{ sm.subevent.get_date_range_display }}
+                            {% else %}
+                                -
+                            {% endif %}
                         </td>
                     {% endif %}
                     <td>