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https://issues.apache.org/jira/browse/FLEX-34937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14945637#comment-14945637
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Robbyn Gerhardt commented on FLEX-34937:
----------------------------------------
This error occurs when the SpellUI has previously been used. If the UndoManager
to undo this change, this error occurs.
> TLF - UndoManager - Crash
> -------------------------
>
> Key: FLEX-34937
> URL: https://issues.apache.org/jira/browse/FLEX-34937
> Project: Apache Flex
> Issue Type: Bug
> Components: Spark: TextArea
> Affects Versions: Apache Flex 4.14.1
> Environment: Adobe AIR, Mac OSX El Capitan, AIR Version 16
> Reporter: Robbyn Gerhardt
> Labels: TextArea, TextLayoutFramework, UndoManager
> Fix For: Apache Flex 4.15.0
>
>
> The manager rushes about in 10 or 12 after you've used it off and brings the
> following error message. So far, no solution.
> TypeError: Error #1009: Cannot access a property or method of a null object
> reference.
> at
> InternalSplitFGEMemento/undo()[/Users/erik/Documents/ApacheFlex/git/flex-tlf/textLayout/src/flashx/textLayout/edit/ModelEdit.as:378]
> at
> SplitMemento/undo()[/Users/erik/Documents/ApacheFlex/git/flex-tlf/textLayout/src/flashx/textLayout/edit/ModelEdit.as:488]
> at
> flashx.textLayout.operations::SplitElementOperation/undo()[/Users/erik/Documents/ApacheFlex/git/flex-tlf/textLayout/src/flashx/textLayout/operations/SplitElementOperation.as:185]
> at
> flashx.textLayout.edit::EditManager/performUndo()[/Users/erik/Documents/ApacheFlex/git/flex-tlf/textLayout/src/flashx/textLayout/edit/EditManager.as:1002]
> at
> flashx.textLayout.operations::FlowOperation/performUndo()[/Users/erik/Documents/ApacheFlex/git/flex-tlf/textLayout/src/flashx/textLayout/operations/FlowOperation.as:201]
> at
> flashx.undo::UndoManager/undo()[/Users/erik/Documents/ApacheFlex/git/flex-tlf/textLayout/src/flashx/undo/UndoManager.as:205]
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