diff --git a/ui/src/dialog.tsx b/ui/src/dialog.tsx
index abaa9e273a..3432d6a492 100644
--- a/ui/src/dialog.tsx
+++ b/ui/src/dialog.tsx
@@ -18,7 +18,7 @@ import React from 'react'
 import { Component, XComponents } from './form'
 import { bond, wave } from './ui'
 
-export const dialogB: Box<Dialog | null> = box(null)
+export const dialogB: Box<Dialog | null> = box()
 
 /**
  * A dialog box (Dialog) is a temporary pop-up that takes focus from the page or app
diff --git a/ui/src/side_panel.tsx b/ui/src/side_panel.tsx
index 21a19121ae..35ec6402eb 100644
--- a/ui/src/side_panel.tsx
+++ b/ui/src/side_panel.tsx
@@ -18,7 +18,7 @@ import React from 'react'
 import { Component, XComponents } from './form'
 import { bond, wave } from './ui'
 
-export const sidePanelB: Box<SidePanel | null> = box(null)
+export const sidePanelB: Box<SidePanel | null> = box()
 
 /**
  * A dialog box (Dialog) is a temporary pop-up that takes focus from the page or app