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# Minecraft Exception in Server Tick Loop Fix


## What does "Exception in server tick loop" mean?

Running into the dreaded **"Exception in server tick loop"** error in Minecraft can be frustrating, especially when you're not sure what's causing it. Also, in many cases, the server may be running in **mixed mode**, which means it's using a blend of interpreted and compiled Java code.

Modded Minecraft servers often trigger 'Unknown Source' errors in crash logs. This crash log typically occurs when the game encounters a critical issue during the server tick process—often related to corrupted chunks, misbehaving mods, or configuration errors.

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## How to Fix "Exception in server tick loop"

Make sure to [create a backup](https://help.sparkedhost.com/en/article/how-to-backup-your-server-2zb28p/) before using the following method, since it includes deleting JSON files, or you can archive the files and save the zip file as a backup.

Whenever you encounter the following error in your Minecraft crash report:

```
java.lang.NullPointerException: Exception in server tick loop
```

To fix the Minecraft "Exception in server tick loop" error on your Minecraft server, you can try to:

1. Open your [Apollo Panel](https://control.sparkedhost.us/)
    
2. Stop your server
    
    ![](https://images.surferseo.art/dd41c5b7-998d-4be9-8a59-4476ad5d4142.png =256x237)
3. Open your **Files Manager**
    
    ![](https://images.surferseo.art/566172e3-916c-4568-aaed-6c3946eac1ec.png =256x763)
4. Find the `ops.json`, `whitelist.json`, and `usercache.json` files and delete them
    
    ![](https://images.surferseo.art/ab2e8c32-a5f1-49c6-8fe1-d106bee95c73.png)
5. Now, load up your server, and this error should be fixed. Ensure you're running the Minecraft version that matches your mods and server version.
    
    ![](https://images.surferseo.art/770f0800-60d2-432d-90b8-88ff41e69c90.png)

## Still have some questions?

If you need any further instructions, you can file a ticket [here](https://billing.sparkedhost.com/submitticket.php)

By: Ali A.