🐛 fix: participant list export crashing issue when some participants don't have lastName

Author: ge85riz

frontend/src/types/employee.ts

@@ -48,10 +48,10 @@ export interface ParticipationDetails {
   eventType: string;
   eventDate: string;
   eventAddress: string;
-  name: string;
-  lastName: string;
-  gitlabUsername: string;
-  email: string;
+  name?: string;
+  lastName?: string;
+  gitlabUsername?: string;
+  email?: string;
   dietTypes: (keyof typeof DietaryPreference)[];
 }
 

frontend/src/utils/utils.ts

@@ -10,7 +10,7 @@ interface DietaryCombinationsResult {
 // Utility function to export participation data as CSV
 export const exportParticipationToCSV = (data: ParticipationDetails[], eventName: string) => {
   // Sort data alphabetically by last name
-  const sortedData = data.sort((a, b) => a.lastName.localeCompare(b.lastName));
+  const sortedData = data.sort((a, b) => (a.lastName || "").localeCompare(b.lastName || ""));
 
   // Define CSV headers
   const headers = [