Site breaks with 404 or fatal error on PHP 8
Plugin triggers a fatal error or 404 pages after the site moves to PHP 8.x, taking the whole site down until it is deactivated.
Tier II · Emerging Problems that are still building up.
4 public reports · first reported 2 November 2017 · last reported 16 June 2026
What's going wrong
Site owners who update PHP to version 8.x report that SEO Ultimate suddenly breaks their website.
AI-assisted: written with the help of AI from the reports. The idea report has the full summary.
In the idea report
- The full summary.
- The products the 4 reports are about, and how many came each month.
- Related problems.
No business has been found with this problem yet, so the report has no contacts. All sales are final — no refunds. Pricing.