diff --git a/src/pretix/plugins/checkinlists/exporters.py b/src/pretix/plugins/checkinlists/exporters.py
index 142b60e59..21739e104 100644
--- a/src/pretix/plugins/checkinlists/exporters.py
+++ b/src/pretix/plugins/checkinlists/exporters.py
@@ -503,7 +503,7 @@ class CSVCheckinList(CheckInListMixin, ListExporter):
         if cl.include_pending:
             headers.append(_('Paid'))
 
-        if form_data['secrets']:
+        if form_data.get('secrets', False):
             headers.append(_('Secret'))
 
         headers.append(_('Email'))
@@ -603,7 +603,7 @@ class CSVCheckinList(CheckInListMixin, ListExporter):
                 ]
                 if cl.include_pending:
                     row.append(_('Yes') if op.order.status == Order.STATUS_PAID else _('No'))
-                if form_data['secrets']:
+                if form_data.get('secrets', False):
                     row.append(op.secret)
                 row.append(op.attendee_email or (op.addon_to.attendee_email if op.addon_to else '') or op.order.email or '')
                 row.append(str(op.order.phone) if op.order.phone else '')