Title: JS Error – Hidden Fields Not Working
Last modified: April 16, 2021

---

# JS Error – Hidden Fields Not Working

 *  Resolved [Urielts](https://wordpress.org/support/users/urielts/)
 * (@urielts)
 * [5 years, 1 month ago](https://wordpress.org/support/topic/js-error-hidden-fields-not-working/)
 * Heya,
 * We’ve been having an issue with a client’s website and the conditional fields
   working for some time, but were hoping a newer version of the plugin would eventually
   address the issue. I’ve searched the support forms and I didn’t find a duplicate
   of this issue, so hoping you may have some insight.
 * Below is the error code we receive in the console view:
 *     ```
       Uncaught TypeError: Cannot read property 'substring' of undefined
           at Object.get_simplified_dom_model (scripts_es6.js:1180)
           at scripts_es6.js:1215
           at Array.forEach (<anonymous>)
           at Object.get_simplified_dom_model (scripts_es6.js:1214)
           at scripts_es6.js:1215
           at Array.forEach (<anonymous>)
           at Object.get_simplified_dom_model (scripts_es6.js:1214)
           at scripts_es6.js:1215
           at Array.forEach (<anonymous>)
           at Object.get_simplified_dom_model (scripts_es6.js:1214)
       get_simplified_dom_model @ scripts_es6.js:1180
       (anonymous) @ scripts_es6.js:1215
       get_simplified_dom_model @ scripts_es6.js:1214
       (anonymous) @ scripts_es6.js:1215
       get_simplified_dom_model @ scripts_es6.js:1214
       (anonymous) @ scripts_es6.js:1215
       get_simplified_dom_model @ scripts_es6.js:1214
       wpcf7cf_reload_dom @ scripts_es6.js:72
       get_nested_conditions @ scripts_es6.js:1126
       ./js/scripts_es6.js.Wpcf7cfForm.updateGroups @ scripts_es6.js:442
       Wpcf7cfForm @ scripts_es6.js:228
       (anonymous) @ scripts_es6.js:1512
       each @ jquery.min.js:2
       each @ jquery.min.js:2
       ./js/scripts_es6.js @ scripts_es6.js:1511
       __webpack_require__ @ bootstrap:19
       0 @ scripts.js:4003
       __webpack_require__ @ bootstrap:19
       (anonymous) @ bootstrap:83
       (anonymous) @ bootstrap:83
       ```
   
 * We are using a custom WP theme that our team developed. Active plugins are the
   latest version of the following:
    Advanced Custom Fields Pro Contact Form 7 Contact
   Form 7 Conditional Fields Yoast SEO
 * We use others, but those are the minimal we need to run the website and try to
   address this error. I can share the link of our development page if that’d be
   beneficial.
 * Thank you for your time!

Viewing 1 replies (of 1 total)

 *  Plugin Author [Jules Colle](https://wordpress.org/support/users/jules-colle/)
 * (@jules-colle)
 * [5 years ago](https://wordpress.org/support/topic/js-error-hidden-fields-not-working/#post-14473150)
 * Hi, so sorry for the late reply. Have been terribly busy.
 * – Could you verify if you run into this problem with a clean WP install and a
   default theme?
    – Does this problem happen in all browsers?

Viewing 1 replies (of 1 total)

The topic ‘JS Error – Hidden Fields Not Working’ is closed to new replies.

 * ![](https://ps.w.org/cf7-conditional-fields/assets/icon-256x256.png?rev=2072595)
 * [Conditional Fields for Contact Form 7](https://wordpress.org/plugins/cf7-conditional-fields/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/cf7-conditional-fields/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/cf7-conditional-fields/)
 * [Active Topics](https://wordpress.org/support/plugin/cf7-conditional-fields/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/cf7-conditional-fields/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/cf7-conditional-fields/reviews/)

 * 1 reply
 * 2 participants
 * Last reply from: [Jules Colle](https://wordpress.org/support/users/jules-colle/)
 * Last activity: [5 years ago](https://wordpress.org/support/topic/js-error-hidden-fields-not-working/#post-14473150)
 * Status: resolved