diff --git a/server/api/events/[id]/register.post.js b/server/api/events/[id]/register.post.js
index 41d7a3a..db13f50 100644
--- a/server/api/events/[id]/register.post.js
+++ b/server/api/events/[id]/register.post.js
@@ -34,7 +34,7 @@ export default defineEventHandler(async (event) => {
           statusMessage: "Series referenced by this event could not be found",
         });
       }
-      if (!series.allowIndividualEventTickets) {
+      if (!series.tickets?.allowIndividualEventTickets) {
         const { hasPass } = checkUserSeriesPass(series, body.email);
         if (!hasPass) {
           throw createError({
diff --git a/tests/server/api/events/register-series.test.js b/tests/server/api/events/register-series.test.js
index 892ef3b..f203d1d 100644
--- a/tests/server/api/events/register-series.test.js
+++ b/tests/server/api/events/register-series.test.js
@@ -109,7 +109,7 @@ describe('POST /api/events/[id]/register — series-pass enforcement', () => {
     mockSeriesFindById.mockResolvedValue({
       _id: seriesId,
       slug: 'series-slug',
-      allowIndividualEventTickets: false,
+      tickets: { allowIndividualEventTickets: false },
       registrations: []
     })
     mockCheckUserSeriesPass.mockReturnValue({ hasPass: false, registration: null })
@@ -138,7 +138,7 @@ describe('POST /api/events/[id]/register — series-pass enforcement', () => {
     mockSeriesFindById.mockResolvedValue({
       _id: seriesId,
       slug: 'series-slug',
-      allowIndividualEventTickets: false,
+      tickets: { allowIndividualEventTickets: false },
       registrations: []
     })
     mockCheckUserSeriesPass.mockReturnValue({
@@ -166,7 +166,7 @@ describe('POST /api/events/[id]/register — series-pass enforcement', () => {
     mockSeriesFindById.mockResolvedValue({
       _id: seriesId,
       slug: 'series-dropin',
-      allowIndividualEventTickets: true,
+      tickets: { allowIndividualEventTickets: true },
       registrations: []
     })
     mockCheckUserSeriesPass.mockReturnValue({ hasPass: false, registration: null })