Web Wook Unknown Error

After activating a webhook for the cases modules i get the following error(see below) every time I tried to create a case from the sugarCRM base platform, it keeps functioning after the record has been created and it sends the event created to the specified endpoint for further processing but keeps throwing the same error...any ideas why this is happening?


How to generate the error:
1: Create a logic Hook ( you can use https://webhook.site/ to test endpoint)
2: Choose POST method .
3: Module Name: cases ( although it fails with any other module)
4: trigger event: After save.
--------After the Web hook has been set up-------------------------
5:create a case FROM THE SUGARCRM cases module, assign to any account/contact (if created from the support portal it won't show any error)
6: The event is sent to the web hook and the case gets created but it shows an error, sometimes Http 500 or unknown error (see image/log).

Has anyone troubleshoot this? is this a configuration issue (even though it's pretty straight forward) ?

Web Hook Error