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Labels.Serialize() crashes on 4.9.4.0 or higher

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After installing MapWinGIS 4.9.4.0 or 4.9.4.2 the Labels.Serialize() function give a AccessViolationExpection error:

An unhandled exception of type 'System.AccessViolationException' occurred

Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

This code executes as expected in 4.3.9.5 but fails on later releases.
 sf = pMapImage.AxMap1.get_Shapefile(iHandle)
 Dim xmlLabelInfo As String = sf.Labels.Serialize()

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