Need help debugging FunctionClauseError Absinthe

Absinthe 1.4.13

I’m getting a not so helpful error from an Absinthe query. Here it is:

[error] #PID<0.8776.0> running MyApp.Endpoint (cowboy_protocol) terminated
Server: localhost:4000 (http)
Request: POST /api
** (exit) {%FunctionClauseError{args: nil, arity: nil, clauses: nil, function: nil, kind: nil, module: nil}, []}

I’m trying to diagnose the issue and have confirmed that the graphql query is received, the database query runs, and then somewhere thereafter this error fires. What’s odd is that this query ran without issue previously and I just noticed today that it stopped working. If you have any suggestions on how to get a better error message or otherwise debug it I’m all ears.