Steps to reproduce:

Tested in Jira v10.3 and v10.4 self-managed setup

1. Import latest Jira media version (24/Mar/2025)
2. Configure action and media
3. Trigger a problem
4. Update the problem in Zabbix (add a comment or ack it)

Result:
The media fails to update the Jira issue with the following error:

Sending failed: Failed to parse response: not well-formed JSON was received

I've managed to make it work but I don't know if this is a proper fix (I'm not a Javascript expert). In line 456 variable "resp" might be empty, so I put the try-catch inside an if:

if (resp != '') {
  try {
    resp = JSON.parse(resp);
  }
  catch (error) {
    throw 'Failed to parse response: not well-formed JSON was received';
  }
}

Also I found Jira is returning HTTP204 to the update request (the petition is ok, but empty response), so I changed line 649 from this:

if ((this.request.getStatus() !== 200 && this.request.getStatus() !== 201)) {

to this:

if ((this.request.getStatus() !== 200 && this.request.getStatus() !== 201 && this.request.getStatus() !== 204)) {

Expected:
Jira media updates the issue and Zabbix marks the action as succesfully executed.