diff --git a/app/controllers/stream_notifications_controller.rb b/app/controllers/stream_notifications_controller.rb
index 11cf20d..c68fbce 100644
--- a/app/controllers/stream_notifications_controller.rb
+++ b/app/controllers/stream_notifications_controller.rb
@@ -60,10 +60,16 @@ class StreamNotificationsController < ApplicationController
   def set_broadcast
     if notification_type == "video.asset.static_renditions.ready"
       live_stream_id = notification.dig(:stream_notification, :data, :live_stream_id)
-      @broadcast = Broadcast.find_by!(stream_uid: live_stream_id)
+      @broadcast = Broadcast.find_by(stream_uid: live_stream_id)
     else
-      @broadcast = Broadcast.find_by!(stream_uid: notification_object_id)
+      @broadcast = Broadcast.find_by(stream_uid: notification_object_id)
     end
+
+    if @broadcast.nil?
+      logger.info "Ignoring broadcast from other environment. Type = #{notification_type}. Id = #{live_stream_id} / #{notification_object_id}"
+      head :ok
+    end
+    head :ok if @broadcast.nil?
   end
 
   def notify_users
diff --git a/spec/controllers/stream_notifications_controller_spec.rb b/spec/controllers/stream_notifications_controller_spec.rb
index 66f948e..8a9211f 100644
--- a/spec/controllers/stream_notifications_controller_spec.rb
+++ b/spec/controllers/stream_notifications_controller_spec.rb
@@ -7,6 +7,7 @@ RSpec.describe StreamNotificationsController, type: :controller do
   let(:active_status) { {type: "video.live_stream.active", object: { id: "mux_stream" }} }
   let(:disconnected_status) { {type: "video.live_stream.disconnected", object: { id: "mux_stream" }} }
   let(:idle_status) { {type: "video.live_stream.idle", object: { id: "mux_stream" }} }
+  let(:idle_status_for_unknown_broadcast) { {type: "video.live_stream.idle", object: { id: "unknown-id" }} }
   let(:asset_ready) { {
     type: "video.asset.static_renditions.ready",
     object: { id: "asset_uid" },
@@ -59,6 +60,12 @@ RSpec.describe StreamNotificationsController, type: :controller do
 
       expect(BroadcastsChannel).to have_received(:stream_recording_ready)
     end
+
+    it "returns OK response even for non-existing broadcast" do
+      post :create, params: idle_status_for_unknown_broadcast
+
+      expect(response).to be_successful
+    end
   end
 
   after do