Increased Function Invocation Errors - ERR_MODULE_NOT_FOUND

Summary

Increased Function Invocation Errors - ERR_MODULE_NOT_FOUND

This incident has been resolved. Some deployments created between May 18, 2026, 06:15 PM - 10:16 PM UTC may have experienced increased ERR_MODULE_NOT_FOUND function invocation errors due to a bad rollout. Deployments created outside of this window are unaffected. The fix is being rolled out to existing deployments retrospectively and is expected to finish in the next few hours.

• Started

  May 18, 2026 · 9:42 PM

• Resolved

  May 18, 2026 · 11:52 PM

• Duration

  2h 9m

• Severity

  Minor

• ◐

  Investigating

  May 18 · 9:42 PM Vercel

  We're investigating an issue where customers are currently experiencing application failures due to function invocation errors when using React Router 7.

• ◆

  Identified

  May 18 · 9:53 PM Vercel

  The issue has been identified and a fix is being implemented.

• ◆

  Identified

  May 18 · 10:11 PM Vercel

  We're continuing to work on rolling out a fix. In the mean time, customers may use Instant Rollback to a previous deployment version as an immediate workaround in order to recover.

• ◉

  Monitoring

  May 18 · 10:16 PM Vercel

  A fix is rolled out for the function invocation errors affecting React Router 7 deployments. To recover, redeploy your application or use Instant Rollback to a previous deployment from the dashboard. We're continuing to monitor.

• ◉

  Monitoring

  May 18 · 10:19 PM Vercel

  We are continuing to monitor for any further issues.

• ✓

  Resolved

  May 18 · 11:52 PM Vercel

  This incident has been resolved. Some deployments created between May 18, 2026, 06:15 PM - 10:16 PM UTC may have experienced increased ERR_MODULE_NOT_FOUND function invocation errors due to a bad rollout. Deployments created outside of this window are unaffected. The fix is being rolled out to existing deployments retrospectively and is expected to finish in the next few hours.