---
title: FUNCTION_INVOCATION_FAILED
product: vercel
url: /docs/errors/FUNCTION_INVOCATION_FAILED
canonical_url: "https://vercel.com/docs/errors/FUNCTION_INVOCATION_FAILED"
last_updated: 2026-02-09
type: reference
prerequisites:
  []
related:
  []
summary: The invocation of a function failed. This is a function error.
install_vercel_plugin: npx plugins add vercel/vercel-plugin
---

# FUNCTION_INVOCATION_FAILED

The `FUNCTION_INVOCATION_FAILED` error occurs when a function invocation fails. This could be due to an error within the function itself, or an issue with the environment in which the function is running.

**Error Code:** `500`

**Name:** Internal Server Error

## Possible causes

- The runtime process (Node.js, Bun, Python, etc.) has crashed.
- Node.js or Bun threw an unhandled rejection/uncaught exception.

## Troubleshoot

To troubleshoot this error, follow these steps:

1. **Check application logs:** Review the application logs to identify any specific errors related to the function invocation. They can be found under the [Logs tab](https://vercel.com/d?to=%2F%5Bteam%5D%2F%5Bproject%5D%2Flogs\&title=Application+Logs)
2. **Review function code:** Ensure that the code for the function is correct and does not contain any errors or infinite loops. Use a `try/catch` block to catch any errors that might be occurring within the function code
3. **Check for unhandled exceptions:** Look for any unhandled exceptions within the function code that might be causing the invocation to fail
4. **Verify function configuration:** Double-check the function configuration to ensure that it's set up correctly, including any environment variables or other settings


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