Title: Function ‘displayError’ finished with error!
Last modified: October 2, 2025

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# Function ‘displayError’ finished with error!

 *  Resolved [bsmolyanov](https://wordpress.org/support/users/bsmolyanov/)
 * (@bsmolyanov)
 * [8 months, 1 week ago](https://wordpress.org/support/topic/function-displayerror-finished-with-error/)
 * When the v. 1.6… versions started coming out I withheld from updating initially.
   Then, yesterday, I saw already v. 1.6.4 – Fixed a bug related to custom REST 
   API endpoint – has already come out, and I decided to finally update directly
   to it.
 * However, now in my scenarios I started seeing the following error, exactly in
   modules which call custom REST API endpoint, e.g. deletion of custom post taxonomy
   relationship.
 * **IMLError
   Function ‘displayError’ finished with error! Cannot read properties
   of undefined (reading ‘toString’)
 * Please consider debugging the plugin once again. I am happy to provide additional
   information on my setup, in case this will help.
 * The same WordPress setup worked without problems before the Make Connector 1.6….
   update.
    -  This topic was modified 8 months, 1 week ago by [bsmolyanov](https://wordpress.org/support/users/bsmolyanov/).

Viewing 6 replies - 1 through 6 (of 6 total)

 *  [davidgurr](https://wordpress.org/support/users/davidgurr/)
 * (@davidgurr)
 * [8 months ago](https://wordpress.org/support/topic/function-displayerror-finished-with-error/#post-18674870)
 * Hi. Thanks for reporting this.
 * We’ve just updated the WordPress app in Make to include better error handling
   and error messages.
 * Could you try again? You should see an error message that gives more details 
   on the source of the problem.
 *  Thread Starter [bsmolyanov](https://wordpress.org/support/users/bsmolyanov/)
 * (@bsmolyanov)
 * [8 months ago](https://wordpress.org/support/topic/function-displayerror-finished-with-error/#post-18674901)
 * Hi, David,
 * Since several days the error says:
    - `[400] Invalid JSON in request body: Syntax error (error code: rest_invalid_json)`
 * However, nothing in the way the value (post ID) passed to Make.com has been changed
   on my side (in WordPress). 
   Moreover, in the Make module itself there is nothing
   in the body. The post ID is passed as part of a custom REST API end point, like“
   posts/postID/delete-terms” where the postID if the variable from Make and ‘delete-
   terms’ is the custom end point, registered in WordPress via PHP code. Therefore
   I am not able to see what json is being sent/received.
    -  This reply was modified 8 months ago by [bsmolyanov](https://wordpress.org/support/users/bsmolyanov/).
 *  [davidgurr](https://wordpress.org/support/users/davidgurr/)
 * (@davidgurr)
 * [8 months ago](https://wordpress.org/support/topic/function-displayerror-finished-with-error/#post-18675159)
 * Are you on a paid plan? If so please create a ticket from the Make Scenario Builder
   screen – click the “?” icon at the bottom left and follow the prompts.
 *  Thread Starter [bsmolyanov](https://wordpress.org/support/users/bsmolyanov/)
 * (@bsmolyanov)
 * [8 months ago](https://wordpress.org/support/topic/function-displayerror-finished-with-error/#post-18676399)
 * It appears that I just had to add empty {} in the body of the API call and that
   resolved the issue.
 *  [davidgurr](https://wordpress.org/support/users/davidgurr/)
 * (@davidgurr)
 * [8 months ago](https://wordpress.org/support/topic/function-displayerror-finished-with-error/#post-18676500)
 * Thanks for confirming. Which module of the WordPress app in Make were you using?
   Make an API Call?
 *  Thread Starter [bsmolyanov](https://wordpress.org/support/users/bsmolyanov/)
 * (@bsmolyanov)
 * [8 months ago](https://wordpress.org/support/topic/function-displayerror-finished-with-error/#post-18677866)
 * Yes, exactly, the Make and API Call. The “Body” parameter was not filled-in and
   this caused the error. However, previously this was not an issue. Now, I inserted{}
   in the body and the error is gone. Method is POST.

Viewing 6 replies - 1 through 6 (of 6 total)

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 * 6 replies
 * 2 participants
 * Last reply from: [bsmolyanov](https://wordpress.org/support/users/bsmolyanov/)
 * Last activity: [8 months ago](https://wordpress.org/support/topic/function-displayerror-finished-with-error/#post-18677866)
 * Status: resolved