Saxon XSLT and XQuery Processor

mistyping the elements attribute of xsl:strip-space
leads to a NullPointerException in 6.4.3

Error on line 4 of
file:/vol/epsilon-vol3/unixsoft/obecker/xsl/x.xsl:
Attribute elemnts is not allowed on this element
Error on line 4 of
file:/vol/epsilon-vol3/unixsoft/obecker/xsl/x.xsl:
Element must have a "elements" attribute
java.lang.NullPointerException
at
com.icl.saxon.style.XSLPreserveSpace.preprocess(Compiled
Code)
at
com.icl.saxon.style.XSLStyleSheet.preprocess(Compiled
Code)
at
com.icl.saxon.PreparedStyleSheet.setStyleSheetDocument(Compiled
Code)
at
com.icl.saxon.PreparedStyleSheet.prepare(Compiled Code)
at
com.icl.saxon.TransformerFactoryImpl.newTemplates(Compiled
Code)
at com.icl.saxon.StyleSheet.doMain(Compiled
Code)
at com.icl.saxon.StyleSheet.main(Compiled Code)