Webhook send to Pabbly came with an empty body

[badym]

Your Workflow URL

https://connect.pabbly.com/workflow/mapping/IjU3NjcwNTZjMDYzNTA0Mzc1MjZkNTUzZDUxMzci_pc

Your Task History ID

IjU3NjUwNTY0MDYzMjA0MzY1MjZiNTUzMzUxMzc1MTY2NTQzMTBmMzYi_pc

Consent to Access & Modify

I authorize Pabbly Support to log in to my account and make changes to the specified workflow for troubleshooting.

Hi,

I am integrating Pabbly with Ontraport, and each time a contact finishes the Journey in Ontraport, I send a Webhook to Pabbly with the info of that contact and then Pabbly adds that contact to Aweber too.

But in the last days in Ontraport I have some Webhooks that ended with the 500 Error.

In Ontraport, I see what data is being sent to Pabbly and it looks like this :

content-type: application/json
HTTP Method: POST
URL: https://connect.pabbly.com/workflow/sendwebhookdata/IjU3NjcwNTZjMDYzNTA0Mzc1MjZkNTUzZDUxMzci_pc
Payload:
{
"first_name": "Timothy",
"email": "[email protected]",
"city": "Concord",
"country": "United States",
"phone": "",
"postalcode": "28027",
"state": "North Carolina",
"address": "",
"affiliate": "",
"product": "",
"itemtype": "",
"itemno": "",
"transactiontype": ""
}

But in pabbly, the task has received an empty message from the Webhook.

Here are the details of a taks with this issue :

Task History ID : IjU3NjUwNTY0MDYzMjA0MzY1MjZiNTUzMzUxMzc1MTY2NTQzMTBmMzYi_pc
Executed at : Feb 24, 2026 18:30:12, (UTC +00:00) America/Danmarkshavn

Can you please advise ?

I have attached screenshots from both Pabbly and Ontraport.

 

[Preeti Paryani]

Hi @badym,

Thank you for sharing the details and the webhook response with us.

We can confirm that the webhook is being captured correctly in other instances. For example, the following task history shows the data being received properly:

Task History ID: IjU3NjUwNTY0MDYzMjA0MzY1MjY5NTUzMzUxMzI1MTYwNTQzMDBmMzMi_pc

However, in the specific task history you shared, the response was received as empty.

Please note that if the webhook URL is opened directly in a browser (by copy-pasting it into the address bar), it sends an empty request to the workflow. It appears that this webhook URL may have been accessed via a browser, which likely caused the empty response entry.

You may safely ignore that instance, as the webhook integration itself appears to be working correctly. Let us know if you continue to face this issue.

 

[badym]

Hi,

The webhooks are being sent automatically from Ontraport. In Ontraport it shows that the info added to the webhook is email, first name etc. Noone is opening it in the browser or anything alike.

But from time to time, the webhook reaches Pabbly with no data.

I have indeed accessed this webhook in the browser, but AFTER I have received the error notification from Ontraport.

So it failed initially and reached Pabbly with no data.

I am just trying to find out where the issue originates.

 

[ArshilAhmad]

Thank you for the information. The Webhook by Pabbly trigger step is based on descriptive webhooks, and we don’t have any control over the data sent from the source application. We simply provide a webhook and display the data that the source application sends to Pabbly Connect. If the source application sends empty data, it will appear as such; however, this issue usually occurs when a webhook is accessed directly in the browser.

To test this, you can connect your source application with Webhook.site and check the data received there. If you receive an empty response there as well, it will confirm that the issue is related to the source application.

Thanks & Regards,
Arshil Ahmad
Customer Support Associate
Pabbly.com
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