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# How to Fix 'Exception Server Tick Loop' Error in Minecraft

> Fix corrupted JSON files causing server tick loop errors.

This error usually means a JSON configuration file is corrupted.

<Warning>Error: `java.lang.NullPointerException: Exception in server tick loop`</Warning>

## Fix

1. Stop your server
2. Go to the file manager
3. Delete these files:
   * `whitelist.json`
   * `banned-player.json`
   * `banned-ips.json`
4. Start your server

The files will regenerate automatically.

**Alternative:** [Restore a backup](/panel/backups#mounting) or fix the JSON files with a [validator](https://jsonlint.com/) (ensure they start and end with `[]`).

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