An AV occurs when debugging a docking operation with TdxDockPanel in Delphi 7 if a breakpoint is set within the dock panel OnDock event handler
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We have fixed the issue described in this ticket and will include the fix in our next maintenance update. To apply this solution before the official update, request a hotfix by clicking the corresponding link for product versions you require.
Note: Hotfixes may be unavailable for beta versions and updates that are about to be released.