kioo NPE on bad filename

kioo-npe.clj

(ns kioo-example.core
  (:require [reagent.core :as reagent]
            [kioo.reagent :as kioo])
  (:require-macros [kioo.reagent :refer [defsnippet deftemplate]]))


(deftemplate error "incorrect-filename.html" [])

;; this is the cljsbuild setup from project.clj

{
 :cljsbuild {:builds {:app {:source-paths ["src/cljs"]
                            :compiler     {:output-to     "resources/public/js/app.js"
                                           :output-dir    "resources/public/js/out"
                                           :source-map    "resources/public/js/out.js.map"
                                           :externs       ["react/externs/react.js"]
                                           :optimizations :none
                                           :pretty-print  true}}}}
 }