diff --git a/sys/apis/ui.lua b/sys/apis/ui.lua
index d49501f..f17d05d 100644
--- a/sys/apis/ui.lua
+++ b/sys/apis/ui.lua
@@ -306,6 +306,9 @@ function Manager:setDefaultDevice(dev)
 end
 
 function Manager:addPage(name, page)
+	if not self.pages then
+		self.pages = { }
+	end
 	self.pages[name] = page
 end