diff --git a/scrape/parse/v3.ts b/scrape/parse/v3.ts
index 912bb92..0560f6e 100644
--- a/scrape/parse/v3.ts
+++ b/scrape/parse/v3.ts
@@ -130,7 +130,7 @@ export default async function parseV3(workbook: Workbook, downloadedFilePath: st
   const schedule: any = {};
 
   for (const { dateKey, sheet } of resolvedDays) {
-    const { changes, absence, inWork, takesPlace, reservedRooms } = extractDaySchedule(sheet, teacherMap, themeColors, annoucements[dateKey].map(a => a.flags).flat());
+    const { changes, absence, inWork, takesPlace, reservedRooms } = extractDaySchedule(sheet, teacherMap, themeColors, annoucements[dateKey]?.map(a => a.flags)?.flat() || []);
 
     schedule[dateKey] = {
       info: { inWork },