We strongly recommend all XenForo customers follow one of the steps below to resolve this issue.
If you have any questions relating to installing this patch or upgrading to the new version, please post in the Upgrade Support forum.
Method 1: Upgrade to the New Version (Recommended)
You may upgrade to XenForo 1.5.4 (or any subsequent version) to fix this issue. You should upgrade as you would to any other release. If you take this approach, you should not apply the patch below.
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Customers with an active license may download this version from their customer area. Full details for how to install and upgrade XenForo can be found in the XenForo Manual.