OfficeViewer plugin fails to preview PowerPoint

[bhw777]

Problem description:
After installing the OfficeViewer plugin, PowerPoint files cannot be previewed correctly. Attempts with all versions and failed, while Excel and Word files can be previewed normally.

Plugin: https://github.com/QL-Win/QuickLook.Plugin.OfficeViewer

OS version: Windows 11 25H2 26200.8037

QuickLook version: v4.4.0

Log is attached.

QuickLook.Exception.log

[emako]

========2026/03/19 PM 03:16:31========
System.NullReferenceException: 未将对象引用设置到对象的实例。
   在 Syncfusion.Presentation.Drawing.DrawingParser.ParseGradientStops(XmlReader reader, GradientStops collection)
   在 Syncfusion.Presentation.Drawing.DrawingParser.ParseGradientFill(XmlReader reader, GradientFill gradientFill)
   在 Syncfusion.Presentation.Drawing.DrawingParser.ParseLineProperties(XmlReader reader, LineFormat lineFormat)
   在 Syncfusion.Presentation.Parser.ParseLineStyleList(XmlReader reader, Theme collection)
   在 Syncfusion.Presentation.Parser.ParseFormatScheme(XmlReader reader, Theme collection)
   在 Syncfusion.Presentation.Parser.ParseThemeElements(XmlReader reader, Theme collection)
   在 Syncfusion.Presentation.Parser.ParseTheme(XmlReader reader, Theme theme)
   在 Syncfusion.Presentation.FileDataHolder.ParseTheme(RelationCollection topRelation, BaseSlide baseSlide, Boolean isThemeOverride)
   在 Syncfusion.Presentation.FileDataHolder.ParseMasterSlide(MasterSlide masterSlide, String masterPath)
   在 Syncfusion.Presentation.FileDataHolder.ParseMasterSlides()
   在 Syncfusion.Presentation.FileDataHolder.Read()
   在 Syncfusion.Presentation.Presentation.ParseDocument(Stream fileStream)
   在 Syncfusion.Presentation.Presentation.OpenAsStream(Stream stream, String password, String extension)
   在 QuickLook.Plugin.OfficeViewer.SyncfusionControl.OpenPowerpoint(String path)
   在 QuickLook.Plugin.OfficeViewer.SyncfusionControl.Open(String path)
   在 QuickLook.Plugin.OfficeViewer.Plugin.View(String path, ContextObject context)
   在 QuickLook.ViewerWindow.<>c__DisplayClass6_0.<BeginShow>b__2()

According to your log:

Root cause hint: crash in Syncfusion.Presentation.Drawing.DrawingParser.ParseGradientStops while parsing theme/line gradient in PPTX.
Likely trigger: malformed or edge-case gradient stop/theme element in slide master/theme.

I'm not sure if Syncfusion has a fix in a later version.