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CTextWindowBase::SetSelectionBegin doesn't null-check the CRefPtr<CTextLine> returned by GetLine() before dereferencing it to fetch m_link. This is only reachable when the window has no lines (GetLineCount() == 0) at the moment of a click — here, a disassembly panel that hasn't yet had a function/frame's code loaded into it (no region, no symbol walk, no frame selected). The fix is to guard the GetLine() result for null in SetSelectionBegin (CTextWindow.cpp around line 559) and skip the selection-link update when the window is empty.

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