---
title: Checkout or Fatal Error After Enabling the Plugin
description: Fatal error at WooCommerce checkout after enabling Maximum Products per User? Steps to fix it.
url: "https://wpfactory.com/docs/max-products-user-error/"
updated: "2026-09-25"
category: Troubleshooting
tags:
  - Maximum Products per User for WooCommerce
---

# Checkout or Fatal Error After Enabling the Plugin

## A fatal error appears at checkout

If your store throws a fatal error at checkout after activating [Maximum Products per User for WooCommerce](https://wpfactory.com/item/maximum-products-per-user-for-woocommerce/), and disabling the plugin clears it, work through the steps below. This kind of error is almost always resolved by updating to the current version.

### Symptoms

- A PHP fatal error during checkout, sometimes referencing the plugin's data class.
- Checkout works again when the plugin is deactivated.

### Fix

1. **Update the plugin** to the latest version first. Older releases contained data-handling fixes that resolve most checkout errors.
2. **Restore checkout** temporarily by deactivating the plugin while you investigate, if the store is down.
3. **Test in isolation:** switch to a default theme with only WooCommerce and this plugin active to rule out a conflict.
4. **Enable WP_DEBUG** and capture the full error and stack trace from the log.
5. **Check unusual product data** (variations, imported meta) that might not match what the plugin expects.
6. **Contact support** with the stack trace and your WordPress, WooCommerce and PHP versions plus the list of active plugins and theme.

**Tip:** always test plugin updates on a staging site before applying them to a live store, since checkout errors affect revenue directly.

### Need a hand?

Our team answers every ticket on the [Maximum Products per User support forum](https://wpfactory.com/support/item/maximum-products-per-user-for-woocommerce/). Include your error log so we can pinpoint the cause quickly.

Related articles

- [How to Customize Purchase Limit Messages and Enforce Limits at Checkout](https://wpfactory.com/docs/frontend-user-limits/)
- [Customers Are Blocked Before Reaching the Purchase Limit](https://wpfactory.com/docs/max-products-blocked-before-limit/)
- [Customers Can Buy More Than the Purchase Limit](https://wpfactory.com/docs/max-products-customers-exceed-limit/)
- [Best Practices and Troubleshooting Checklist](https://wpfactory.com/docs/max-products-user-guide/)
- [Time-Based Limits Are Not Resetting](https://wpfactory.com/docs/time-based-limits-not-resetting/)

 

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