Page saves fail with invalid JSON response
Saving a page in the Elementor editor fails with a server error or invalid JSON response because extra CSS leaks into the AJAX reply.
Tier I · Proven The best-established problems.
5 public reports · first reported 25 September 2026 · last reported 13 October 2026
What's going wrong
Site owners on WordPress sites using the Elementor page builder report that saving or updating a page suddenly fails with a server error or a message saying the response is not valid JSON.
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 5 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.