fix: add null type guards to buildRows to prevent crashes on missing types

myteamwallet_backend/src/cashbox-export/cashbox-export.utils.spec.ts

@@ -72,4 +72,32 @@ describe('buildRows', () => {
     const rows = buildRows(team() as any, '2026-08-01', '2026-08-31');
     expect(rows).toEqual([]);
   });
+
+  it('skips transactions with null type and includes valid ones', () => {
+    const rows = buildRows(
+      team({
+        transactions: [
+          { date: '2026-08-05T00:00:00.000Z', amount: 100, note: 'Valid credit', type: { name: 'credit' } },
+          { date: '2026-08-06T00:00:00.000Z', amount: 50, note: 'Null type team wallet', type: null },
+        ],
+        players: [
+          {
+            firstName: 'Bob',
+            lastName: 'Smith',
+            transactions: [
+              { date: '2026-08-07T00:00:00.000Z', amount: 20, note: 'Valid payment', type: { name: 'payment' } },
+              { date: '2026-08-08T00:00:00.000Z', amount: 30, note: 'Null type player', type: null },
+            ],
+          },
+        ],
+      }) as any,
+      '2026-08-01',
+      '2026-08-31',
+    );
+
+    expect(rows).toEqual([
+      { date: '2026-08-05T00:00:00.000Z', type: 'credit', who: 'Teamkasse', note: 'Valid credit', amount: 100, runningTotal: 100 },
+      { date: '2026-08-07T00:00:00.000Z', type: 'payment', who: 'Bob Smith', note: 'Valid payment', amount: 20, runningTotal: 120 },
+    ]);
+  });
 });

myteamwallet_backend/src/cashbox-export/cashbox-export.utils.ts

@@ -24,6 +24,7 @@ export function buildRows(team: Team, from: string, to: string): CashboxExportRo
   const raw: RawRow[] = [];
 
   for (const transaction of team.transactions ?? []) {
+    if (!transaction.type) continue;
     raw.push({
       date: transaction.date,
       type: transaction.type.name,
@@ -35,7 +36,7 @@ export function buildRows(team: Team, from: string, to: string): CashboxExportRo
 
   for (const player of team.players ?? []) {
     for (const transaction of player.transactions ?? []) {
-      if (transaction.type.name !== 'payment') continue;
+      if (!transaction.type || transaction.type.name !== 'payment') continue;
       raw.push({
         date: transaction.date,
         type: transaction.type.name,