NullPointerException - project with XSLT and XQuery

[CanOfBees]

Hi @rhdunn -

I'm not sure what's causing this exception to pop up, other than there was an initial blurb that pointed to the XSLT stylesheet (that I lost) but here's the stacktrace. If the message about the file comes back I'll share it here.

java.lang.NullPointerException
	at uk.co.reecedunn.intellij.plugin.xdm.schema.XdmSchemaListType.getLanguage(XdmSchemaListType.kt:26)
	at uk.co.reecedunn.intellij.plugin.xdm.schema.injection.SchemaTypeLanguageInjection.getLanguagesToInject(SchemaTypeLanguageInjection.kt:37)
	at com.intellij.psi.impl.source.tree.injected.InjectedLanguageManagerImpl.processInPlaceInjectorsFor(InjectedLanguageManagerImpl.java:498)
	at com.intellij.psi.impl.source.tree.injected.InjectedLanguageUtilBase.probeElementsUpInner(InjectedLanguageUtilBase.java:237)
	at com.intellij.psi.impl.source.tree.injected.InjectedLanguageUtilBase.lambda$probeElementsUp$0(InjectedLanguageUtilBase.java:217)
	at com.intellij.openapi.application.impl.ReadActionCacheImpl$allowInWriteAction$1.invoke(ReadActionCacheImpl.kt:41)
	at com.intellij.openapi.application.impl.ReadActionCacheImpl$allowInWriteAction$1.invoke(ReadActionCacheImpl.kt:41)
	at com.intellij.openapi.application.impl.ReadActionCacheImpl.allowInWriteAction(ReadActionCacheImpl.kt:29)
	at com.intellij.openapi.application.impl.ReadActionCacheImpl.allowInWriteAction(ReadActionCacheImpl.kt:41)
	at com.intellij.psi.impl.source.tree.injected.InjectedLanguageUtilBase.probeElementsUp(InjectedLanguageUtilBase.java:216)
	at com.intellij.psi.impl.source.tree.injected.InjectedLanguageUtilBase.enumerate(InjectedLanguageUtilBase.java:159)
	at com.intellij.psi.impl.source.tree.injected.InjectedLanguageManagerImpl.enumerateEx(InjectedLanguageManagerImpl.java:383)
	at com.intellij.codeInsight.daemon.impl.LineMarkersPass.queryLineMarkersForInjected(LineMarkersPass.java:251)
	at com.intellij.codeInsight.daemon.impl.LineMarkersPass.queryProviders(LineMarkersPass.java:212)
	at com.intellij.codeInsight.daemon.impl.LineMarkersPass.lambda$doCollectMarkers$2(LineMarkersPass.java:108)
	at com.intellij.codeInsight.daemon.impl.Divider.divideInsideAndOutsideInOneRoot(Divider.java:97)
	at com.intellij.codeInsight.daemon.impl.LineMarkersPass.doCollectMarkers(LineMarkersPass.java:104)
	at com.intellij.codeInsight.daemon.impl.LineMarkersPass.doCollectInformation(LineMarkersPass.java:77)
	at com.intellij.codeHighlighting.TextEditorHighlightingPass.collectInformation(TextEditorHighlightingPass.java:67)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$doRun$2(PassExecutorService.java:427)
	at com.intellij.platform.diagnostic.telemetry.helpers.TraceKt.use(trace.kt:30)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$doRun$3(PassExecutorService.java:423)
	at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction(AnyThreadWriteThreadingSupport.kt:351)
	at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:972)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$doRun$4(PassExecutorService.java:413)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$14(CoreProgressManager.java:674)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:749)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:705)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:673)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:79)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.doRun(PassExecutorService.java:412)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$run$0(PassExecutorService.java:388)
	at com.intellij.openapi.fileTypes.impl.FileTypeManagerImpl.cacheFileTypesInside(FileTypeManagerImpl.java:822)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$run$1(PassExecutorService.java:388)
	at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.executeByImpatientReader(AnyThreadWriteThreadingSupport.kt:544)
	at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:176)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.run(PassExecutorService.java:386)
	at com.intellij.concurrency.JobLauncherImpl$VoidForkJoinTask$1.exec(JobLauncherImpl.java:266)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:507)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1491)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:2073)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:2035)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:187)

The stylesheet that seems to be the culprit is pretty simple:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                version="3.0"
                xmlns:xs="http://www.w3.org/2001/XMLSchema"
                exclude-result-prefixes="#all">
  <xsl:output method="xml"/>

  <xsl:variable name="content-id" select="_[@type='object']/id[@type='number']"/>
  <xsl:template match="@*|node()">
    <xsl:copy>
      <xsl:apply-templates select="@*|node()"/>
    </xsl:copy>
  </xsl:template>
</xsl:stylesheet>

I can't tell how critical this is, but wanted to submit a report. Hope you're well!
Thanks!