bug: create label got crash

[misaka18848]

local basalt = require("basalt")

basalt.setTheme({
ButtonBG = colors.lightBlue,
ButtonText = colors.white,
FrameBG = colors.white
})

local start = basalt.createFrame()
local aLabel = start:addLabel()
aLabel:setText("Hello, World!")
aLabel:setFontSize(2)

basalt.autoUpdate()