How to check either editor is a valid object

[moteus]

I have a plugin with the next functions

local _editor
Package.onEditorUpdateUI = function(self, editor, event)
    if bit.band(event:GetUpdated(), wxstc.wxSTC_UPDATE_SELECTION) > 0 then
        _editor = editor
    end
end

Package.onIdle = function(self)
    if not _editor then return end
    local editor = _editor
    _editor = false
    local color = editor:GetCaretLineBackground()

And some time I got error like attempt to index local 'editor' (a userdata value) This happen when I close editors quite fast. Is there any way to check either editor can be used?

[pkulchenko]

Yes, you can use ide:IsValidCtrl(editor); it's used in several places in event handlers.