diff --git a/resources/public/html/local.html b/resources/public/html/local.html
index 868d48c..1d37726 100644
--- a/resources/public/html/local.html
+++ b/resources/public/html/local.html
@@ -5,18 +5,22 @@
     <script crossorigin src="https://unpkg.com/react-dom@17/umd/react-dom.production.min.js"></script>
     <script src="../js/scittle.reagent.js" type="application/javascript"></script>
     <script type="application/x-scittle">
-      (require '[reagent.core :as r]
-           '[reagent.dom :as rdom])
+      (require '[sci.core :as sci])
+      (defn try-load-string [s]
+       (try
+         (js/scittle.core.eval_string s)
+        (catch ^:sci/error js/Error e
+         (run! println (-> (sci/stacktrace e) (sci/format-stacktrace))))))
 
-      (def state (r/atom {:clicks 0}))
+(try-load-string "
+(defn f []
+  (subs nil 42))
 
-      (defn my-component []
-       [:div
-        [:p "Clicks: " (:clicks @state)]
-        [:p [:button {:on-click #(do (print :foo) (println :dude) (prn (with-out-str (prn :foo))) (swap! state update :clicks inc))}
-             "Click me!"]]])
+(defn g []
+  (f))
 
-      (rdom/render [my-component] (.getElementById js/document "app"))
+(g)
+")
     </script>
   </head>
   <body>
diff --git a/src/scittle/core.cljs b/src/scittle/core.cljs
index aa342cd..a19a314 100644
--- a/src/scittle/core.cljs
+++ b/src/scittle/core.cljs
@@ -30,7 +30,9 @@
     'random-uuid random-uuid
     'read-string (sci/copy-var read-string rns)}
    'goog.object {'set gobject/set
-                 'get gobject/get}})
+                 'get gobject/get}
+   'sci.core {'stacktrace sci/stacktrace
+              'format-stacktrace sci/format-stacktrace}})
 
 (def !sci-ctx
   (atom (sci/init {:namespaces namespaces
@@ -56,10 +58,7 @@
   (try (-eval-string s)
        (catch :default e
          (error/error-handler e (:src @!sci-ctx))
-         (let [sci-error? (isa? (:type (ex-data e)) :sci/error)]
-           (throw (if sci-error?
-                    (or (ex-cause e) e)
-                    e))))))
+         (throw e))))
 
 (defn register-plugin! [plug-in-name sci-opts]
   plug-in-name ;; unused for now
