Fusion Builder breaks on PHP 8 upgrades
Fusion Builder throws critical errors or fails to activate once a site moves from PHP 7.4 to PHP 8.x.
Tier II · Emerging Problems that are still building up.
3 public reports · first reported 18 September 2023 · last reported 24 November 2025
What's going wrong
Owners who upgrade their host from PHP 7.4 to PHP 8.1 find that the Fusion Builder plugin triggers critical errors on activation, or that pages become unusable.
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 3 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.