cannot read property 'force_children' of undefined om alpha26 - clojurescript

Question

My app was working correctly until I decided to upgrade to om-alpha26.
Now I'm getting: Cannot read property 'force_children' of undefined
I have tried deleting my target folder and executing 'lein clean' to no avail.
Nothing comes up on google, I made no other code changes apart form updating the om version in my project.clj. I'm using chestnut as my development environment.
Here's my project.clj:
:source-paths ["src/clj"]
:test-paths ["test/clj"]
:dependencies [[org.clojure/clojure "1.7.0"]
[org.clojure/clojurescript "1.7.145" :scope "provided"]
[ring "1.4.0"]
[ring/ring-defaults "0.1.5"]
[slester/ring-browser-caching "0.1.1"]
[bk/ring-gzip "0.1.1"]
[compojure "1.4.0"]
[enlive "1.1.6"]
[org.omcljs/om "1.0.0-alpha26"]
[environ "1.0.0"]
[com.datomic/datomic-pro "0.9.5327"]
[liberator "0.13"]
[cljs-ajax "0.5.1"]
[clj-http "2.0.0"]
[org.apache.httpcomponents/httpclient "4.3.5"]
[org.clojure/data.json "0.2.6"]
[overtone/at-at "1.2.0"]
[com.cognitect/transit-clj "0.8.281"]
[com.cognitect/transit-cljs "0.8.225"]
[com.stuartsierra/component "0.2.3"]
[http-kit "2.1.19"]
[com.taoensso/sente "1.6.0"]
[reaver "0.1.2"]
[clj-time "0.11.0"]
[differ "0.2.1"]
]
:repositories [["my.datomic.com" {:url "https://my.datomic.com/repo"
:username ["******"]
:password ["****"]}]]
:plugins [[lein-cljsbuild "1.0.5"]
[lein-environ "1.0.0"]
[lein-auto "0.1.2"]]
:min-lein-version "2.5.0"
:uberjar-name "ngbc.jar"
: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"
:preamble ["react/react.min.js"]
:optimizations :none
:pretty-print true}}}}
:profiles {:dev {:source-paths ["env/dev/clj"]
:test-paths ["test/clj"]
:dependencies [[figwheel "0.3.9"]
[figwheel-sidecar "0.5.0-2"]
[com.cemerick/piggieback "0.2.1"]
[org.clojure/tools.nrepl "0.2.10"]
[weasel "0.7.0"]]
:repl-options {:init-ns ngbc.server
:nrepl-middleware [cemerick.piggieback/wrap-cljs-repl]}
:plugins [[lein-figwheel "0.3.9"]]
:figwheel {:http-server-root "public"
:server-port 3449
:css-dirs ["resources/public/css"]
:ring-handler ngbc.server/http-handler}
:env {:is-dev true
:browser-caching {"text/javascript" 0
"text/html" 0}}
:cljsbuild {:test-commands { "test" ["phantomjs" "env/test/js/unit-test.js" "env/test/unit-test.html"] }
:builds {:app {:source-paths ["env/dev/cljs"]}
:test {:source-paths ["src/cljs" "test/cljs"]
:compiler {:output-to "resources/public/js/app_test.js"
:output-dir "resources/public/js/test"
:source-map "resources/public/js/test.js.map"
:preamble ["react/react.min.js"]
:optimizations :whitespace
:pretty-print false}
:notify-command ["phantomjs" "bin/speclj" "resources/public/js/app_test.js"]
}}}}
:uberjar {:source-paths ["env/prod/clj"]
:hooks [leiningen.cljsbuild]
:env {:production true
:browser-caching {"text/javascript" 604800
"text/html" 0}}
:omit-source true
:aot :all
:main ngbc.server
:cljsbuild {:builds {:app
{:source-paths ["env/prod/cljs"]
:compiler
{:optimizations :whitespace
:pretty-print false}}}}}})
UPDATE:
The 'force_children' function is not one that I've defined. Following the stack trace it looks like it is being called on a (om.dom/div ....children). When I remove child nodes from the expression the code compiles, here's the code:
(defui RootView
static om/IQuery
(query [this]
(let [bonus-subquery (om/get-query Bonus)]
`[{:bonuses ~bonus-subquery}]))
Object
(render [this]
(let [{:keys [bonuses]} (om/props this)]
(dom/div nil <--- ERROR OCCURS HERE
(dom/header nil
(dom/div #js {:className "search-header"}
(dom/a #js {:className "logo"})))
(dom/ul #js {:className "simple-sidebar"}
(dom/li nil
(dom/div #js {:className "fa fa-gift"})))
(dom/div #js {:className "row no-margin main-container"}
(dom/div #js {:className "col-xs-12 no-padding"}
(dom/div #js {:className "artist-songs-container"}
#_(dom/input nil "Title")
#_(dom/input nil "Bonus")
(dom/h6 nil "My Bonuses")
(apply dom/div nil
[(dom/h3 nil "Collect")
(bonus-list-view
(sort-by-posted bonuses))]))))))))
I suspect it is to do with chestnut because the error doesn't occur when I upload the code to heroku. Here's the stack trace:
> Uncaught TypeError: Cannot read property 'force_children' of
> undefined(anonymous function) #
> core.cljs?rel=1450501232093:143
>
>ReactCompositeComponentMixin._renderValidatedComponentWithoutOwnerOrCont>ext#react.inc.js:5933
>
>ReactCompositeComponentMixin._renderValidatedComponent
> # react.inc.js:5953
>
wrapper #react.inc.js:12336
>
>ReactCompositeComponentMixin.mountComponent #
> react.inc.js:5566
>
>wrapper #
> react.inc.js:12336
>
>ReactReconciler.mountComponent #
> react.inc.js:12961
>
>ReactCompositeComponentMixin.mountComponent #
> react.inc.js:5571
>
>wrapper #
> react.inc.js:12336
>
>ReactReconciler.mountComponent #
> react.inc.js:12961
>
>mountComponentIntoNode #
> react.inc.js:10854
>
>Mixin.perform #
> react.inc.js:15613
>
>batchedMountComponentIntoNode #
> react.inc.js:10870
>
>Mixin.perform #
> react.inc.js:15613
>
>ReactDefaultBatchingStrategy.batchedUpdates #
> react.inc.js:8443
>
>batchedUpdates #
> react.inc.js:13689
>
>ReactMount._renderNewRootComponent #
> react.inc.js:11064
>
>wrapper #
> react.inc.js:12336
>
>ReactMount._renderSubtreeIntoContainer #
> react.inc.js:11133
>
>ReactMount.render # react.inc.js:11153wrapper #
> react.inc.js:12336
>
>(anonymous function) #
> next.cljs?rel=1447028869174:1236
>
>(anonymous function) #
> next.cljs?rel=1447028869174:1079
>
>(anonymous function) #
> next.cljs?rel=1447028869174:1090
>
>om.next.Reconciler.om$next$protocols$IReconciler$add_root_BANG_$arity$4
> # next.cljs?rel=1447028869174:1111
>
>om$next$protocols$add_root_BANG_ #
> protocols.cljs?rel=1447028869504:13
>
>om.next.add_root_BANG_.cljs$core$IFn$_invoke$arity$4
> # next.cljs?rel=1447028869174:660
>
>om$next$add_root_BANG_ #
> next.cljs?rel=1447028869174:647
>
>om.next.add_root_BANG_.cljs$core$IFn$_invoke$arity$3
> # next.cljs?rel=1447028869174:654
>
>om$next$add_root_BANG_ #
> next.cljs?rel=1447028869174:647
>
>ngbc$core$main #
> core.cljs?rel=1450501232093:240
>
>(anonymous function) #
> main.cljs?rel=1448073424172:14
>
>core.cljs?rel=1447680439306:164
Thanks!