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VercelIncident detail
Increased Function Invocation Errors - ERR_MODULE_NOT_FOUND
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Timeline
Incident updates
Every update on the official status source, oldest to newest, exactly as it appeared there.
Investigating
We're investigating an issue where customers are currently experiencing application failures due to function invocation errors when using React Router 7.
Identified
The issue has been identified and a fix is being implemented.
Identified
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
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
We are continuing to monitor for any further issues.
Resolved
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.
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