Unreachable Exception

[Sibot]

Hi
Im getting an exception from within Mandrill-dotnet code that I find the root of.

Snippet of the Exception I get:
Serialization Error to Post: messages/send-template.json ---> System.AggregateException: One or more errors occurred. ---> Mandrill.Utilities.MandrillException: Serialization Error to Post: messages/send-template.json at Mandrill.MandrillApi.<Post>d__2e1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Mandrill.MandrillApi.d__22.MoveNext()`

When looking at the code it seems this line is what is throwing:
https://github.com/shawnmclean/Mandrill-dotnet/blob/master/src/Mandrill/MandrillApi.cs#L120
Catching a JsonException and throwing a MandrillException.

The culprit as I see it, should be content that is hidden within the code. An unexpected response that is not handled or some such.

Any Idea how to handle this or find a way to see what is causing it?