diff --git a/backend/src/routes/door.ts b/backend/src/routes/door.ts
index d856e0f..608e51c 100644
--- a/backend/src/routes/door.ts
+++ b/backend/src/routes/door.ts
@@ -84,7 +84,8 @@ function toDoorAttendee(
   };
 }
 
-async function loadEvent(eventId: string) {
+async function loadEvent(eventId: string | undefined) {
+  if (!eventId) return null;
   const event = await dbGet<any>(
     (db as any).select().from(events).where(eq((events as any).id, eventId))
   );
diff --git a/backend/src/routes/payments.ts b/backend/src/routes/payments.ts
index 72ad423..2544ad4 100644
--- a/backend/src/routes/payments.ts
+++ b/backend/src/routes/payments.ts
@@ -667,7 +667,7 @@ paymentsRouter.post('/:id/send-reminder', requireAuth(['admin', 'organizer']), a
   }
   
   try {
-    const result = await emailService.sendPaymentReminder(id);
+    const result = await emailService.sendPaymentReminder(payment.id);
     
     if (result.success) {
       const now = getNow();
diff --git a/backend/src/routes/tickets.ts b/backend/src/routes/tickets.ts
index 3333b59..49f266c 100644
--- a/backend/src/routes/tickets.ts
+++ b/backend/src/routes/tickets.ts
@@ -1174,7 +1174,7 @@ ticketsRouter.post('/:id/mark-paid', requireAuth(['admin', 'organizer', 'staff']
   
   // Send confirmation emails asynchronously (don't block the response)
   Promise.all([
-    emailService.sendBookingConfirmation(id),
+    emailService.sendBookingConfirmation(ticket.id),
     payment ? emailService.sendPaymentReceipt(payment.id) : Promise.resolve(),
   ]).catch(err => {
     console.error('[Email] Failed to send confirmation emails:', err);