diff --git a/ui/js/src/main/scala/works/iterative/ui/scenarios/ScenarioMain.scala b/ui/js/src/main/scala/works/iterative/ui/scenarios/ScenarioMain.scala
index bc2ffe0..2417246 100644
--- a/ui/js/src/main/scala/works/iterative/ui/scenarios/ScenarioMain.scala
+++ b/ui/js/src/main/scala/works/iterative/ui/scenarios/ScenarioMain.scala
@@ -2,6 +2,7 @@
 
 import com.raquo.laminar.api.L.*
 import com.raquo.waypoint.*
+import zio.*
 import org.scalajs.dom
 import ui.components.tailwind.TailwindSupport
 import works.iterative.core.MessageCatalogue
@@ -55,7 +56,12 @@
         override def open(content: HtmlElement): Unit = ()
         override def close(): Unit = ()
       val dispatcher: ZIODispatcher[Nothing] =
-        _ => ()
+        new ZIODispatcher[Nothing]:
+          def dispatch(action: ZIO[Nothing, Nothing, Unit]): Unit = ()
+          def dispatchStream[A](
+              action: ZIO[Nothing, Nothing, A]
+          ): EventStream[A] =
+            EventStream.empty
 
     def container: HtmlElement =
       div(