Invalid JSON in console log

Hi,

When the form is submitted, it does not display the send confirmation in FireFox and Microsoft Edge browsers. The message only appears in the Chrome browser. The form works because I receive an email on my mail.

When I inspect the Mircosoft Edge console log I get the error beow:

Object
code: “invalid_json”
message: “The response is not a valid JSON response”
Protorype: Object

The error shows in function w(e) in catch.(function(e) { return console.error(e) … as undefined.

The image that shows this error from Edge console I send in the link below:

https://postimg.cc/fVSPqRnS

Thank you in advance for any support.