[Sentry: APP-H08] Crash toggling Sage Intacct default vendor when vendors list is empty

[mountiny]

Sentry

https://expensify.sentry.io/issues/APP-H08

Impact (snapshot at filing)

• Users (total since first seen): 1
• Events: 3
• Users (last 14d): 1
• First seen: 2026-07-03
• Last seen: 2026-07-03 (ongoing)
• Platform: web
• App version(s): 9.4.25-2
• Affected route(s) (parameterized): /workspaces/:policyID/accounting/sage-intacct/export/reimbursable
• Mechanism: auto.browser.browserapierrors.requestAnimationFrame

Stack trace (top frames, first-party only)

Switch.tsx:75 (<anonymous>) → onToggle(!isOn)
ToggleSettingsOptionRow.tsx:240 (t16) → onToggle(isOn)
SageIntacctReimbursableExpensesPage.tsx:83 (menuItems.onToggle) → vendors?.[0].id

Suspected cause

Optional chaining stops at vendors?.[0]; when the vendors array is empty, [0] is undefined and accessing .id throws. Same pattern exists on the non-reimbursable export page.

Reproduction

1. Connect a workspace to Sage Intacct with an empty vendors list (or before vendors sync completes).
2. Navigate to Accounting → Sage Intacct → Export → Reimbursable expenses.
3. Toggle "Default vendor" ON.
4. Observe TypeError in console: Cannot read properties of undefined (reading 'id').

Related

• Sibling Sentry IDs (if any): none
• Prior GH issues: none
• Fix PR: pending

[mountiny]

Fix PR: #95345