This example throws "Uncaught Error: No protocol method IDeref.-deref defined for type null: " when used with reagent-forms 0.4.3

reagent-form-visible.cljs

(ns forms-playground.core
  (:require [reagent.core :as reagent :refer [atom]]
            [reagent-forms.core :refer [bind-fields]]
            [cljsjs.react :as react]))


(def form-template
  [:form
   [:div.checkbox
    [:label
     [:input {:type "checkbox" :field :checkbox :id :enable-details?}]]]
       
   ; expecting to make this group visible only if checkbox is checked.
   [:div.form-group
    {:field    :container
     :visible? #(:enable-details? %)} ; when :visible? is removed, there is no exception
    [:input {:field :text :id :first-name}]
    [:input {:field :text :id :last-name}]]])


(defn form []
  (let [doc (atom {:enable-details? false})]
    (fn []
      [:div
       [:div.page-header [:h1 "Reagent Form"]]
       [bind-fields form-template doc]
       [:label (str @doc)]])))


(defn main
  []
  [:div.container
   [form]])


(defn init! []
  (reagent/render-component [main] (.getElementById js/document "app")))