Error in copy pasting ILG elements

I have some text and two consecutive ilgs(Inline Graphic Elements). When I try to copy ilgs with the text or without text, and paste them I get following error.

TypeError: Error #1009: Cannot access a property or method of a null object reference.

at flashx.textLayout.edit::TextScrap/copyTextScrap()

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.container::DisplayObjectContainerController/processPasteEvent()

at flashx.textLayout.container::DisplayObjectContainerController/pasteHandler()

at flash.events::EventDispatcher/dispatchEventFunction()

at flash.events::EventDispatcher/dispatchEvent()

at flash.ui::ContextMenuItem$/_paste()

at flash.display::NativeMenu/_display()

at flash.display::NativeMenu/display()

at flash.ui::ContextMenu/display()

at flash.display::InteractiveObject/onContextMenuEvent()