Cannot read property 'properties' of undefined exception when using Swagger page

[alexandis]

I used Swagger for a while for my Web API. Lately I've added a couple of application services - nothing especial, like all others, but cannot test them, since getting JS exception. So, when I press "Try it out" button - I am getting this exception. I am using the latest Swashbuckle Nuget version. Before this Nuget update, I had another exception - "Cannot read property '$ref' of undefined" - on version 5.5.1.

I am getting three exceptions at once and they look the same. The page gets irresponsive afterwards:

I don't have this exception on another API calls, but how it can be related to the kind of calls, if there is no exception in ApplicationService constructor?