diff --git a/src/pretix/control/templates/pretixcontrol/boxoffice/payment.html b/src/pretix/control/templates/pretixcontrol/boxoffice/payment.html
index ac213481f5..fbe1613078 100644
--- a/src/pretix/control/templates/pretixcontrol/boxoffice/payment.html
+++ b/src/pretix/control/templates/pretixcontrol/boxoffice/payment.html
@@ -28,7 +28,15 @@
             <dt>{% trans "Receipt number" context "terminal_zvt" %}</dt>
             <dd>{{ payment_info.payment_data.receiptNumber }}</dd>
             <dt>{% trans "Card type" context "terminal_zvt" %}</dt>
-            <dd>{{ payment_info.payment_data.cardName|default_if_none:payment_info.payment_data.cardType }}</dd>
+            <dd>
+                {% if payment_info.payment_data.cardName %}
+                    {{ payment_info.payment_data.cardName }}
+                {% elif payment_info.payment_data.cardType %}
+                    {{ payment_info.payment_data.cardType }}
+                {% else %}
+                    {% trans "Unknown" %}
+                {% endif %}
+            </dd>
             <dt>{% trans "Card expiration" context "terminal_zvt" %}</dt>
             <dd>{{ payment_info.payment_data.expiry }}</dd>
         {% endif %}