ParaEdit throws RTE TypeError #1009

I guess our customer pasted something, then two RTE happened.

The first RTE is below
----------------------------------------------------------*
TypeError: Error #1009
at flashx.textLayout.edit::ParaEdit$/insertText()
at flashx.textLayout.operations::InsertTextOperation/doInternal()
at flashx.textLayout.operations::InsertTextOperation/doOperation()
at flashx.textLayout.edit::EditManager/doInternal()
at flashx.textLayout.edit::EditManager/doOperation()
at flashx.textLayout.edit::EditManager/flushPendingOperations()
at flashx.textLayout.edit::EditManager/insertText()
at spark.components::RichEditableText/handlePasteOperation()
at spark.components::RichEditableText/textContainerManager_flowOperationEndHandler()
at flash.events::EventDispatcher/dispatchEvent()
at flashx.textLayout.container::TextContainerManager/dispatchEvent()
at flash.events::EventDispatcher/dispatchEvent()
at flashx.textLayout.elements::TextFlow/dispatchEvent()
at flashx.textLayout.edit::EditManager/doInternal()
at flashx.textLayout.edit::EditManager/doOperation()
at flashx.textLayout.edit::EditManager/pasteTextScrap()
at flashx.textLayout.edit::EditManager/editHandler()
at flashx.textLayout.container::ContainerController/editHandler()
at flashx.textLayout.container::TextContainerManager/editHandler()
at flash.desktop::NativeApplication/_onKeyDownCapture()

The 2nd RTE happened in the same second and it's below.
----------------------------------------------------------*
TypeError: Error #1009
at flashx.textLayout.edit::TextFlowEdit$/insertTextScrap()
at flashx.textLayout.operations::PasteOperation/doOperation()
at flashx.textLayout.edit::EditManager/doInternal()
at flashx.textLayout.edit::EditManager/doOperation()
at flashx.textLayout.edit::EditManager/pasteTextScrap()
at flashx.textLayout.edit::EditManager/editHandler()
at flashx.textLayout.container::ContainerController/editHandler()
at flashx.textLayout.container::TextContainerManager/editHandler()
at flash.desktop::NativeApplication/_onKeyDownCapture()

I'm asking what a user pasted to s:TextInput.
This RTE does not happen often but it happens sometimes.

Also s:TextInput#restrict = "0-9".
I tried to paste
1. something not text like a file and an image,
2. a cell of MS Excel
3. text of MS Word
4. text with CRLF
But I could not reproduce this RTE.

thanks