Title: invalid_json
Last modified: June 14, 2021

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# invalid_json

 *  [appelsappel](https://wordpress.org/support/users/appelsappel/)
 * (@appelsappel)
 * [4 years, 11 months ago](https://wordpress.org/support/topic/invalid_json/)
 * Hey there,
 * I seem to have a problem with my form, linked with this plugin. If I deactivate
   the plugin, it works again.
 * The exception is:
    code: “invalid_json” message: “The response is not a valid
   JSON response.”
 * You can try to enter something in the form if you want to try.
 * I hope you have some ideas as where this bug is coming from. If you need more
   info let me know.
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Finvalid_json%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Thread Starter [appelsappel](https://wordpress.org/support/users/appelsappel/)
 * (@appelsappel)
 * [4 years, 11 months ago](https://wordpress.org/support/topic/invalid_json/#post-14556005)
 * [14-Jun-2021 20:47:48 UTC] PHP Notice: Undefined index: HTTP_HOST in /home/customer/
   www/psychologieinhetonderwijs.nl/public_html/wp-content/plugins/wpcf7-redirect/
   classes/class-wpcf7r-updates.php on line 40
 * also found this in my log, could this have something to do with it?
 *  Thread Starter [appelsappel](https://wordpress.org/support/users/appelsappel/)
 * (@appelsappel)
 * [4 years, 11 months ago](https://wordpress.org/support/topic/invalid_json/#post-14560013)
 * i posted the wrong exception, meant this one: Notice: Undefined index: post in/
   home/customer/www/psychologieinhetonderwijs.nl/public_html/wp-content/plugins/
   wpop-accf/includes/accf7-settings.php on line 39
 *  Plugin Author [wpoperations](https://wordpress.org/support/users/wpoperations/)
 * (@wpoperations)
 * [4 years, 11 months ago](https://wordpress.org/support/topic/invalid_json/#post-14621712)
 * Hi there!
 * Thank you for writing in
 * Please delete that older version plugin once. And install the latest version 
   again.
    Hope this will help you.
 * Thank You.

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘invalid_json’ is closed to new replies.

 * ![](https://ps.w.org/wpop-accf/assets/icon-256x256.png?rev=1936314)
 * [Active Campaign & Contact Form 7](https://wordpress.org/plugins/wpop-accf/)
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 * 3 replies
 * 2 participants
 * Last reply from: [wpoperations](https://wordpress.org/support/users/wpoperations/)
 * Last activity: [4 years, 11 months ago](https://wordpress.org/support/topic/invalid_json/#post-14621712)
 * Status: not resolved