Title: JS errors on form backend.
Last modified: August 30, 2016

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# JS errors on form backend.

 *  Resolved [Isaac Lubow](https://wordpress.org/support/users/isaaclubow/)
 * (@isaaclubow)
 * [10 years, 6 months ago](https://wordpress.org/support/topic/js-errors-on-form-backend/)
 * I have a fresh install of WordPress, with no other plugins installed. On Ninja
   Forms (with no add-ons) edit page, the Delete buttons on fields do nothing, and
   the Favorite field throws this error:
    `ninja-forms-admin.min.js?nf_ver=2.9.30&
   ver=4.4:1 Uncaught TypeError: Cannot read property 'length' of null`. I’m not
   able to use the plugin as a result.
 * [https://wordpress.org/plugins/ninja-forms/](https://wordpress.org/plugins/ninja-forms/)

The topic ‘JS errors on form backend.’ is closed to new replies.

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## Tags

 * ["js error"](https://wordpress.org/support/topic-tag/js-error/)

 * 0 replies
 * 1 participant
 * Last reply from: [Isaac Lubow](https://wordpress.org/support/users/isaaclubow/)
 * Last activity: [10 years, 6 months ago](https://wordpress.org/support/topic/js-errors-on-form-backend/)
 * Status: resolved