Attempt to submit corrupted post data

  • Resolved beanto90

    (@beanto90)


    11 months ago

    Hi, I use WPForms Lite and it’s been working fine until now.

    When someone enters the form and ‘submit’, the error returned is: attempt to submit corrupted post data. Everything was up-to-date at the time (themes, plugins).

    I’ve tried going through the reCAPTCHA and taking the website back to a known time it was working. It worked for the first test and then stopped again (I’ve not re-updated any plugins from that time).

    I’ve tried on safari and google chrome, emptying the cache each time.

    On the console area, it mentions ‘jquery is not defined’. Any assistance would be appreciated. Thank you.

    The page I need help with: [log in to see the link]

Viewing 8 replies - 1 through 8 (of 8 total)
  • Plugin Support Ralden Souza

    (@rsouzaam)

    11 months ago

    Hi @beanto90,

    Thanks for reaching out, and I’m sorry to hear about the “Attempt to submit corrupted post data” error you’re seeing.

    From the URL you shared, it looks like your page was built with Elementor. In that case, please make sure you’re using the WPForms widget as explained in this guide.

    Also, I noticed you’re using the SiteGround Optimizer plugin. Some of the JavaScript optimization settings in that plugin can sometimes cause issues — especially when using Google reCAPTCHA v2 Checkbox, as in your form.

    To fix this, please review and adjust your optimization settings by following our SiteGround Optimizer setup guide. Once done, don’t forget to purge your cache and test your form again using a private/incognito window to see if the issue persists.

    I hope that does the trick!

    If you’re still running into trouble, please share the details from WPForms > Tools > System Info (screenshot for reference). This information may help us better understand the issue you’re experiencing.

    Thanks!

    Thread Starter beanto90

    (@beanto90)

    11 months ago

    Hi @rsouzaam thanks for your reply.

    Yes, I’ve checked and have the WPForms widget.

    Doing the form test under ‘preview mode’ on the WPForms plugin works fine, but it has the error when attempting to submit on the contact page of the site.

    I’ve also followed your suggestion about the SiteGround Optimiser, disabled both, purged cache and attempted the form via two different browsers in incognito, but same error unfortunately.

    Here’s the WPForms system info:

                ### Begin System Info ###

    — WPForms Info

    Lite: Mar 27, 2022 at 8:04am (GMT)
    Lite Connect: Backup is enabled since Jul 29, 2023 at 6:03pm (GMT)

    — Site Info

    Site URL: https://dojangx.com
    Home URL: https://dojangx.com
    Multisite: No

    — WordPress Configuration

    Version: 6.8.1
    Language: en_GB
    User Language: en_GB
    Permalink Structure: /%postname%/
    Active Theme: OceanWP 4.1.0
    Show On Front: page
    Page On Front: Martial Arts Abingdon and Didcot (#9)
    Page For Posts: Unset
    ABSPATH: /home/customer/www/dojangx.com/public_html/
    Table Prefix: Length: 4 Status: Acceptable
    WP_DEBUG: Disabled
    WPFORMS_DEBUG: Not set
    Memory Limit: 256M
    Registered Post Stati: publish, future, draft, pending, private, trash, auto-draft, inherit, request-pending, request-confirmed, request-failed, request-completed, spam
    Revisions: Enabled

    — WordPress Uploads/Constants

    WP_CONTENT_DIR: /home/customer/www/dojangx.com/public_html/wp-content
    WP_CONTENT_URL: https://dojangx.com/wp-content
    UPLOADS: Not set
    wp_uploads_dir() path: /home/customer/www/dojangx.com/public_html/wp-content/uploads/2025/07
    wp_uploads_dir() url: https://dojangx.com/wp-content/uploads/2025/07
    wp_uploads_dir() basedir: /home/customer/www/dojangx.com/public_html/wp-content/uploads
    wp_uploads_dir() baseurl: https://dojangx.com/wp-content/uploads

    — Must-Use Plugins

    Health Check Troubleshooting Mode: 1.9.2

    — WordPress Active Plugins

    Akismet Anti-spam: Spam Protection: 5.4
    Broken Link Checker: 2.4.6
    Classic Widgets: 0.3
    Custom Sidebars: 3.38
    Elementor: 3.30.1
    Essential Addons for Elementor: 6.2.0
    Feeds for YouTube: 2.4.0
    Icegram Express – Email Subscribers, Newsletters and Marketing Automation Plugin: 5.8.9
    Jetpack: 14.8
    Jetpack Boost: 4.1.1
    Ocean Extra: 2.4.9
    PixelYourSite: 11.0.0.4
    Premium Addons for Elementor: 4.11.17
    Pretty Google Calendar: 2.0.0
    Reviews Feed: 2.1.1
    Sassy Social Share: 3.3.76
    Security Optimizer: 1.5.7
    Simple Membership: 4.6.5
    Site Kit by Google: 1.156.0
    Smash Balloon Custom Facebook Feed: 4.3.2
    Smash Balloon Instagram Feed: 6.9.1
    Smush: 3.20.0
    Speed Optimizer: 7.7.2
    UpdraftPlus – Backup/Restore: 1.25.6
    Wordfence Security: 8.0.5
    WP Consent API: 1.0.8
    WPForms Lite: 1.9.6.2
    WP Mail SMTP: 4.5.0
    Yoast SEO: 25.4

    — WordPress Inactive Plugins

    CookieYes | GDPR Cookie Consent: 3.3.1
    Health Check & Troubleshooting: 1.7.1

    — Webserver Configuration

    PHP Version: 8.2.28
    MySQL Version: 8.0.41
    Webserver Info: Apache

    — PHP Configuration

    Memory Limit: 768M
    Upload Max Size: 256M
    Post Max Size: 256M
    Upload Max Filesize: 256M
    Time Limit: 120
    Max Input Vars: 3000
    Display Errors: N/A

    — PHP Extensions

    cURL: Supported
    fsockopen: Supported
    SOAP Client: Installed
    Suhosin: Not Installed

    — Session Configuration

    Session: Disabled End System Info ###

    Thanks 🙂

    Thread Starter beanto90

    (@beanto90)

    11 months ago

    @rsouzaam I’ve had another thorough look through today and noticed that by deactivating the Speed Optimizer plug in, the issue resolved! I’ve reinstalled it, disabled all functions, and switch by switch turned them back on to see which one causes the error. I think I found it, however, it was one of the same that I disabled yesterday and the error still showed after several times :/ I’ll keep it on the current setting and will wait until tomorrow and recheck again every so often. If it’s still fixed by then, I’ll close this as resolved. Thanks for the suggestion that it could be the Optimizer plugin.

    Plugin Support Ralden Souza

    (@rsouzaam)

    11 months ago

    Hi @beanto90,

    Thanks for the update!

    I was able to successfully submit your form using an incognito window (screenshot).

    It looks like your fix in the Speed Optimizer plugin did the trick! However, based on some of my tests, the issue can still occur if Google reCAPTCHA doesn’t load properly.

    If the issue comes up again, I recommend reaching out to the Speed Optimizer support forum and sharing the details of the issue. They should be able to provide more guidance on how to avoid the issue — particularly around ensuring Google reCAPTCHA loads correctly.

    If you have any questions, feel free to let me know.

    Thanks!

    Thread Starter beanto90

    (@beanto90)

    11 months ago

    Thanks @rsouzaam – I’ve also had success with the form this morning 🙂

    I suppose another alternative will be to not use the plugin at all if problems appear again with the reCAPTCHA. Would there be any other free plugins that you could suggest as alternatives to Speed Optimizer, please?

    Plugin Support Ralden Souza

    (@rsouzaam)

    11 months ago

    Hi @beanto90,

    Thanks for your follow-up question!

    If you’re using SiteGround as your hosting provider, it’s recommended to use their Speed Optimizer plugin.

    However, looking at the System Info, I noticed that you also have the Jetpack Boost plugin active. In this case, I suggest checking if the following two settings are disabled (screenshot):

    • Cache Site Pages — To avoid conflicts with the Speed Optimizer plugin. It’s best to use only one caching solution on your site to prevent potential conflicts that may cause errors with your form.
    • Defer Non-Essential JavaScript — JavaScript optimization can sometimes interfere with how forms work, so it’s safer to keep this turned off.

    Here’s what I recommend for the next steps:

    1. Make sure both of those options are disabled in Jetpack Boost.
    2. Then, purge the cache using the Speed Optimizer plugin.
    3. Monitor the site over the next few days to see if the issue is solved.

    I hope this helps! If you have any questions or run into any trouble, please don’t hesitate to reach out.

    Thanks!

    Thread Starter beanto90

    (@beanto90)

    11 months ago

    Hi @rsouzaam thanks for your reply.

    I’ve checked and those two functions are already disabled from my Jetpack plugin 🙂

    I’ll mark this thread as resolved now. Thanks again for your help!

    Plugin Support Ralden Souza

    (@rsouzaam)

    10 months, 3 weeks ago

    Hi @beanto90,

    Thanks for the information!

    Please always feel welcome to reach out if you need help with WPForms Lite. I’m happy to assist.

    Thanks!

Viewing 8 replies - 1 through 8 (of 8 total)

The topic ‘Attempt to submit corrupted post data’ is closed to new replies.