Duplicate Unique Key Error in Wow: How to Fix It in 5 Steps

Clear your WoW cache to get rid of the duplicate key error

by Claire Moraa
Claire Moraa
Claire Moraa
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Claire likes to think she's got a knack for solving problems and improving the quality of life for those around her. Driven by the forces of rationality, curiosity,... read more
Reviewed by Alex Serban
Alex Serban
Alex Serban
Windows Server & Networking Expert
After moving away from the corporate work-style, Alex has found rewards in a lifestyle of constant analysis, team coordination and pestering his colleagues. Holding an MCSA Windows Server... read more
Affiliate Disclosure
  • The duplicate unique key error is a common error that occurs in World of Warcraft when you try to launch a game and get stuck at the same point.
  • Usually, cache build-up is the culprit and getting rid of that folder can do you some good so that you can continue playing WoW.

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If you are getting a Duplicate unique key error in WoW, then you are not alone. This error can occur when you try to run the game or attempt to access the launcher. It’s no surprise as the multi-player game experiences high latency and frequently disconnects.

WoW is no stranger to errors as users have also experienced error BLZBNTAGT00000BB8 where they are prompted to update their game. However, as soon as they try to update, they are met with this error code.

What causes the duplicate unique key error in WoW?

If you’re wondering what triggered the duplicate unique key error in WoW, below are some possible causes:

  • Incompatible mods – If you have a mod installed incompatible with your version of World of Warcraft, or your addons have been reset after an update, this can also happen. 
  • Cached files – WoW is a huge game with a lot of data, and it’s not uncommon for things to go wrong, especially when too much data accumulates over time. 
  • Corrupt data – If you have recently installed any third-party applications or tools that may interfere with the Blizzard launcher, they may cause issues with WoW.
  • Compromised account – If you’re using the wrong account, or if your account has been compromised, you might see this error message when you try to log in to World of Warcraft.
  • Server conflicts – Sometimes, it has everything to do with Blizzard and nothing to do with you. In such cases, you can only wait.

How do I fix the duplicate unique key error in WoW?

To ensure that you have covered all the bases, check the following before proceeding to the advanced solutions:

  • Check and free up some hard drive space on your computer if you don’t have enough. 
  • Verify the server status and check for any maintenance schedules.
  • Log out and log back into your account.
  • Try restarting your PC to clear any temporary files.

1. Clear cache

  1. Hit the Windows + E keys to open File Explorer.
  2. Go to the World of Warcraft folder and locate the Cache file: C:\program Files (x86)\World of Warcraft\_retail_\
  3. Right-click on it and select Delete.

2. Run WoW as administrator

  1. Right-click on the Blizzard launcher and select Properties.
  2. Navigate to the Compatibility tab and click on Change settings for all users.
  3. Check the Run this program as administrator box under Settings.

Some applications require administrative access to function properly. If you’re using a local account, you need to log in using an administrator account or assign yourself some administrative privileges. Other errors that may require permissions include WoW fatal error 134.

3. Use the WoW scan and repair tool

  1. Open your Blizzard account and click on Games.
  2. Select WoW, navigate to Options, and click on Scan and Repair.
  3. Wait for the scan to complete and try again.

4. Update your Operating System

  1. Hit the Start Menu icon and click on Settings.
  2. Select Windows Update and click on Check for updates.check-updates-w11 windows 11 blue screen
  3. Download and install if available.

5. Contact Blizzard customer service

The Duplicate unique key 8783 error is a fairly new issue, so it is possible that the team at Blizzard is not yet aware. If you have tried all the steps above and have been unable to fix the issue on your own, then you should contact Blizzard customer service for help.

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Since the error manifests itself in different forms such as:

  • Duplicate ‘unique key’ 8783 found for ID 1572 in table ItemBonusListGroupEntry
  • WoW error 134 duplicate ‘unique key’ 211489 found for id 1948 in dbfilesclient\pvptalent.db2

Ensure to include all the specifics when reporting so that Blizzard can be able to identify and respond to the problem faster.

It is also possible that your router has a build-up of cache that may have become corrupted over time. Resetting it or resetting your network will allow you to start up with no issues.

Aside from the duplicate unique key error in WoW, you may also encounter other related problems. These can include driver compatibility issues with WoW so ensure you check out our article on how to counter this hurdle.

We also have an answer for the users who experience lag spikes and high ping issues. Our recommendation of top WoW VPNs should be able to help in such situations.

Let us know of any additional thoughts you may have on this topic.

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