Swagger UI returning 500 with new version

Hi

We are using the swagger UI POST /debug service to validate our swagger documents. However lately we have started to get an internal server error (code 500) rather than the normal response (code 200 + any validation errors)

I have tried the same swagger doc in the swagger editor which works fine. Here is an example with intentional errors, that returns an internal error in swagger UI:

{
"swagger":"2.0",
"info":
{
"version":"2.0.0",
"title":"Beanhunter API",
"description":"Description of the api goes here."
},
"host":"local.xxx.com",
"schemes":["http"],
"consumes":["application/json"],
"produces":["application/json"],
"paths":
{
"/city":
{
"get":
{
"description":"test description"
}
}
},
"definitions":
{
"Endpoints":
{
"title":"Endpoints object","properties":
{
"links":{}
}
}
}
} 

Any ideas?

Thanks

- Jakob