NullPointerException on a valid PPTX

On the attached PPTX file, which opens fine with Powerpoint, the Tika parser throws the following error:

java.lang.NullPointerException
at org.apache.tika.parser.microsoft.ooxml.XSLFPowerPointExtractorDecorator.buildXHTML(XSLFPowerPointExtractorDecorator.java:110)
at org.apache.tika.parser.microsoft.ooxml.AbstractOOXMLExtractor.getXHTML(AbstractOOXMLExtractor.java:109)
at org.apache.tika.parser.microsoft.ooxml.OOXMLExtractorFactory.parse(OOXMLExtractorFactory.java:112)
at org.apache.tika.parser.microsoft.ooxml.OOXMLParser.parse(OOXMLParser.java:87)