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Opening existing document when non-initial song is active crashes #147

@nyanpasu64

Description

@nyanpasu64
 	Dn-FamiTracker.exe!AfxAssertFailedLine(const char * lpszFileName, int nLine) Line 317	C++
 	Dn-FamiTracker.exe!CFamiTrackerDoc::GetTrack(unsigned int Track) Line 3959	C++
 	Dn-FamiTracker.exe!CFamiTrackerDoc::GetFrameCount(unsigned int Track) Line 3336	C++
 	Dn-FamiTracker.exe!CPatternEditor::GetFrameCount() Line 2418	C++
 	Dn-FamiTracker.exe!CPatternEditor::CursorUpdated() Line 739	C++
 	Dn-FamiTracker.exe!CFamiTrackerView::RedrawPatternEditor() Line 578	C++
 	Dn-FamiTracker.exe!CFamiTrackerView::InvalidateCursor() Line 537	C++
 	Dn-FamiTracker.exe!CFamiTrackerView::OnKillFocus(CWnd * pNewWnd) Line 860	C++
 	[External Code]	
 	Dn-FamiTracker.exe!CFamiTrackerDoc::GetTrack(unsigned int Track) Line 3959	C++
 	Dn-FamiTracker.exe!CFamiTrackerDoc::GetFrameCount(unsigned int Track) Line 3336	C++
 	Dn-FamiTracker.exe!CPatternEditor::GetFrameCount() Line 2418	C++
 	Dn-FamiTracker.exe!CPatternEditor::CursorUpdated() Line 739	C++
 	Dn-FamiTracker.exe!CFamiTrackerView::RedrawPatternEditor() Line 578	C++
>	Dn-FamiTracker.exe!CFamiTrackerView::OnUpdate(CView * __formal, __int64 lHint, CObject * __formal) Line 1445	C++
 	[External Code]	
 	Dn-FamiTracker.exe!CFamiTrackerDoc::SetMachine(machine_t Machine) Line 3391	C++
 	Dn-FamiTracker.exe!CFamiTrackerDoc::SetupChannels(unsigned char Chip) Line 4019	C++
 	Dn-FamiTracker.exe!CFamiTrackerDoc::ReadBlock_Parameters(CDocumentFile * pDocFile, const int Version) Line 1767	C++
 	Dn-FamiTracker.exe!CFamiTrackerDoc::OpenDocumentNew(CDocumentFile & DocumentFile) Line 1621	C++
 	Dn-FamiTracker.exe!CFamiTrackerDoc::OpenDocument(const char * lpszPathName) Line 1343	C++
 	Dn-FamiTracker.exe!CFamiTrackerDoc::OnOpenDocument(const char * lpszPathName) Line 287	C++
 	[External Code]	
 	Dn-FamiTracker.exe!WinMain(HINSTANCE__ * hInstance, HINSTANCE__ * hPrevInstance, char * lpCmdLine, int nCmdShow) Line 26	C++
 	[External Code]	

I have no clue why this stack is so funny and includes two CFamiTrackerDoc::GetTrack() calls.

This will more reliably reproduce on debug builds.

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