Overview
With ACF 6.3.12 and above, there are two potential errors that can appear if ACF is unable to verify the security nonce while validating your fields.
ACF was unable to perform validation because the provided nonce failed verification.
This error indicates that ACF received a security nonce, but the nonce failed verification. This can occur if you’ve left the browser open for a long time while editing a page. To confirm if that’s the case, try logging out and back in again.
If that doesn’t help, and you have a development/staging version of the site, you can try deactivating any other plugins and themes to rule out a potential conflict.
ACF was unable to perform validation because no nonce was received by the server.
This happens when ACF doesn’t receive a security nonce at all. This most commonly happens when the PHP max_input_vars setting is too low and there are lots of ACF fields present on the page. To correct this, ask your host to see what your current max_input_vars setting is, and if it can be increased to at least 10,000.
If you’ve tried the above and are still running into this issue, please contact our support team and we’ll be glad to help troubleshoot further.
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Related
- ACF Blocks: Disable Field Validation in ACF Blocks
- Guides: Debug, diagnose and solve
- Guides: License Activations
- Actions: acf/validate_save_post
- Filters: acf/validate_value
