Converting Presentation file with broken summary links leads to GroupDocsConversionException

GroupDocs.Conversion Product Family
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1

We are running into an issue with GroupDocs.Conversion v26.1.0 when trying to convert a presentation document that contains broken summary links.

We get the following exception:

GroupDocs.Conversion.Exceptions.GroupDocsConversionException: Value cannot be null. (Parameter 'key')\r\n ---> System.ArgumentNullException: Value cannot be null. (Parameter 'key')\r\n   at e.(Exception , ConverterSettings \b, \b )\r\n   at e.\b(CancellationToken )\r\n   at e.\b.()\r\n   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)\r\n--- End of stack trace from previous location ---\r\n   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)\r\n   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)\r\n   --- End of inner exception stack trace ---\r\n   at e..(Exception )\r\n   at System.AggregateException.Handle(Func`2 predicate)\r\n   at e.(CancellationToken )\r\n   at GroupDocs.Conversion.Converter.(CancellationToken )\r\n   at GroupDocs.Conversion.Converter.Convert(ConvertOptions convertOptions, Action`1 documentCompleted, CancellationToken cancellationToken)\r\n

We used the following code and file to reproduce this issue:

Pictures and SmartArt - Summary Section is broken - small.zip (44.8 KB)

[Test]
public async Task Converting_PresentationWithBrokenSummaryLinks_ThrowsException()
{
	// Arrange
	var filename = "Pictures and SmartArt - Summary Section is broken - small.pptx";
	var path = Path.Combine(TestContext.CurrentContext.TestDirectory, "TestData", "Presentation", filename);
	await using var originalDocument = File.Open(path, FileMode.Open);

	// Act
	using var converter = new Converter(
		() => originalDocument,
		context =>
		{
			var loadOptions = new PresentationLoadOptions
			{
				ShowHiddenSlides = true,
				SkipExternalResources = true,
				ClearBuiltInDocumentProperties = true,
				ClearCustomDocumentProperties = true,
				NotesPosition = PresentationNotesPosition.BottomFull,
			};

			return loadOptions;
		});

	using var outputStream = new MemoryStream();
	var options = new PdfConvertOptions
	{
		PdfOptions = new PdfOptions
		{
			Linearize = true,
		},
	};

	var action = () => converter.Convert(
		options,
		(ConvertedContext convertedContext) =>
		{
			convertedContext.ConvertedStream.Position = 0;
			convertedContext.ConvertedStream.CopyTo(outputStream);
		});

	var exception = action.Should().Throw<GroupDocsConversionException>().Which;
}

Is there a way we can convert this file without this throwing an exception? Ideally in a similar manner to what happens when one saves the presentation as a PDF.