Can't list crm webhooks

Attempting to get a list of defined webhooks fails with 'Undefined variable: term'

[root@freepbx oauth-google]# curl -H "Token: <redacted>" http://localhost/admin/api/sangomacrm/rest/webhooks/both | python -m json.tool
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100    38  100    38    0     0    385      0 --:--:-- --:--:-- --:--:--   383
{
    "message": "Undefined variable: term"
}

rolling back to 14.0.1.16 resolves, but webhooks are broken in that version so not a work around.