No implementation of conform* for type nil

```
IllegalArgumentException No implementation of method: :conform* of protocol: #'spectrum.conform/Spect found for class: nil  clojure.core/-cache-protocol-fn (core_deftype.clj:583)
```

When running `check/check` on this code: https://gist.github.com/didibus/d0228ffad9b920c201410806b157ff10

Using version 0.1.3