S2S Api - Internal Server Error - Converting Circular Structure to Json

[rksh1997]

I deployed beaconctrl to heroku, with the button you provided (deploy to heroku).
when trying to create a new admin, [POST] /s2s_api/v1/admins
It responds with internal server error (500) saying this "Converting circular structure to json"
with response data: {
registerations: []
}