Android Studio 3.5 Canary 3
Build #AI-183.5153.38.35.5256920, built on January 24, 2019
JRE: 1.8.0_152-release-1248-b22 x86_64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
macOS 10.14.2

Version of Gradle Plugin: 3.5.0-alpha03
Version of Gradle: gradle-5.1.1-all.zip

Steps to Reproduce:
1. No idea, this happened at some point yesterday and I wasn't paying attention.

java.lang.NullPointerException
at org.jetbrains.android.dom.navigation.NavigationSchema$NavigatorKeyInfo.<init>(NavigationSchema.java:273)
at org.jetbrains.android.dom.navigation.NavigationSchema.buildCacheKeys(NavigationSchema.java:486)
at org.jetbrains.android.dom.navigation.NavigationSchema.init(NavigationSchema.java:480)
at org.jetbrains.android.dom.navigation.NavigationSchema.createIfNecessary(NavigationSchema.java:390)
at org.jetbrains.android.dom.AttributeProcessingUtil.processNavAttributes(AttributeProcessingUtil.java:408)
at org.jetbrains.android.dom.AttributeProcessingUtil.processAttributes(AttributeProcessingUtil.java:596)
at org.jetbrains.android.dom.AndroidDomExtender.registerExtensions(AndroidDomExtender.java:62)
at org.jetbrains.android.dom.AndroidDomExtender.registerExtensions(AndroidDomExtender.java:29)
at com.intellij.util.xml.reflect.DomExtenderEP.extend(DomExtenderEP.java:83)
at com.intellij.util.xml.impl.DynamicGenericInfo.runDomExtenders(DynamicGenericInfo.java:134)
at com.intellij.util.xml.impl.DynamicGenericInfo.lambda$checkInitialized$0(DynamicGenericInfo.java:64)
at com.intellij.openapi.util.RecursionManager$2.doPreventingRecursion(RecursionManager.java:98)
at com.intellij.util.xml.impl.DynamicGenericInfo.checkInitialized(DynamicGenericInfo.java:63)
at com.intellij.util.xml.impl.DynamicGenericInfo.getAttributeChildrenDescriptions(DynamicGenericInfo.java:241)
at com.intellij.xml.impl.dom.AbstractDomChildrenDescriptor.getAttributeDescriptor(AbstractDomChildrenDescriptor.java:184)
at com.intellij.xml.impl.dom.AbstractDomChildrenDescriptor.getAttributeDescriptor(AbstractDomChildrenDescriptor.java:195)
at org.jetbrains.android.dom.AndroidXmlTagDescriptor.getAttributeDescriptor(AndroidXmlTagDescriptor.java:147)
at com.intellij.psi.impl.source.xml.XmlAttributeImpl.getDescriptorImpl(XmlAttributeImpl.java:386)
at com.intellij.psi.impl.source.xml.XmlAttributeImpl.lambda$getDescriptor$0(XmlAttributeImpl.java:368)
at com.intellij.psi.util.CachedValuesManager.lambda$getCachedValue$0(CachedValuesManager.java:140)
at com.intellij.psi.impl.PsiCachedValueImpl.doCompute(PsiCachedValueImpl.java:49)
at com.intellij.util.CachedValueBase.getValueWithLock(CachedValueBase.java:222)
at com.intellij.psi.impl.PsiCachedValue.getValueWithLock(PsiCachedValue.java:60)
at com.intellij.psi.impl.PsiCachedValueImpl.getValue(PsiCachedValueImpl.java:38)
at com.intellij.util.CachedValuesManagerImpl.getCachedValue(CachedValuesManagerImpl.java:88)
at com.intellij.psi.util.CachedValuesManager.getCachedValue(CachedValuesManager.java:139)
at com.intellij.psi.util.CachedValuesManager.getCachedValue(CachedValuesManager.java:126)
at com.intellij.psi.impl.source.xml.XmlAttributeImpl.getDescriptor(XmlAttributeImpl.java:367)
at com.intellij.psi.impl.source.xml.XmlAttributeReference$1.compute(XmlAttributeReference.java:37)
at com.intellij.psi.impl.source.xml.XmlAttributeReference$1.compute(XmlAttributeReference.java:34)
at com.intellij.openapi.util.NullableLazyValue.getValue(NullableLazyValue.java:37)
at com.intellij.psi.impl.source.xml.XmlAttributeReference.getDescriptor(XmlAttributeReference.java:116)
at com.intellij.psi.impl.source.xml.XmlAttributeReference.resolve(XmlAttributeReference.java:63)
at com.intellij.psi.impl.source.xml.XmlAttributeReference.isReferenceTo(XmlAttributeReference.java:100)
at com.intellij.psi.search.SingleTargetRequestResultProcessor.processTextOccurrence(SingleTargetRequestResultProcessor.java:38)
at com.intellij.psi.impl.search.PsiSearchHelperImpl$3.lambda$execute$0(PsiSearchHelperImpl.java:783)
at com.intellij.psi.impl.search.LowLevelSearchUtil.processTreeUp(LowLevelSearchUtil.java:138)
at com.intellij.psi.impl.search.LowLevelSearchUtil.processElementsAtOffsets(LowLevelSearchUtil.java:225)
at com.intellij.psi.impl.search.PsiSearchHelperImpl$3.execute(PsiSearchHelperImpl.java:779)
at com.intellij.psi.impl.search.PsiSearchHelperImpl$2.processInReadAction(PsiSearchHelperImpl.java:232)
at com.intellij.psi.impl.search.PsiSearchHelperImpl$2.processInReadAction(PsiSearchHelperImpl.java:223)
at com.intellij.openapi.application.ReadActionProcessor.lambda$process$0(ReadActionProcessor.java:28)
at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:973)
at com.intellij.openapi.application.ReadAction.compute(ReadAction.java:57)
at com.intellij.openapi.application.ReadActionProcessor.process(ReadActionProcessor.java:28)
at com.intellij.psi.impl.search.PsiSearchHelperImpl.lambda$processCandidates$14(PsiSearchHelperImpl.java:739)
at com.intellij.psi.impl.search.PsiSearchHelperImpl.lambda$processVirtualFile$6(PsiSearchHelperImpl.java:426)
at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1166)
at com.intellij.openapi.application.ex.ApplicationUtil.tryRunReadAction(ApplicationUtil.java:43)
at com.intellij.psi.impl.search.PsiSearchHelperImpl.processVirtualFile(PsiSearchHelperImpl.java:410)
at com.intellij.psi.impl.search.PsiSearchHelperImpl.lambda$processPsiFileRoots$2(PsiSearchHelperImpl.java:306)
at com.intellij.psi.impl.search.PsiSearchHelperImpl.lambda$null$3(PsiSearchHelperImpl.java:363)
at com.intellij.openapi.application.impl.ReadMostlyRWLock.executeByImpatientReader(ReadMostlyRWLock.java:147)
at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:222)
at com.intellij.psi.impl.search.PsiSearchHelperImpl.lambda$processFilesConcurrentlyDespiteWriteActions$4(PsiSearchHelperImpl.java:362)
at com.intellij.concurrency.ApplierCompleter.execAndForkSubTasks(ApplierCompleter.java:133)
at com.intellij.concurrency.ApplierCompleter.tryToExecAllList(ApplierCompleter.java:223)
at com.intellij.concurrency.ApplierCompleter.execAndForkSubTasks(ApplierCompleter.java:151)
at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1166)
at com.intellij.concurrency.ApplierCompleter.lambda$wrapInReadActionAndIndicator$1(ApplierCompleter.java:105)
at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:582)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:532)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:87)
at com.intellij.concurrency.ApplierCompleter.wrapInReadActionAndIndicator(ApplierCompleter.java:116)
at com.intellij.concurrency.ApplierCompleter.lambda$compute$0(ApplierCompleter.java:96)
at com.intellij.openapi.application.impl.ReadMostlyRWLock.executeByImpatientReader(ReadMostlyRWLock.java:147)
at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:222)
at com.intellij.concurrency.ApplierCompleter.compute(ApplierCompleter.java:96)
at java.util.concurrent.CountedCompleter.exec(CountedCompleter.java:731)
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
at java.util.concurrent.ForkJoinPool$WorkQueue.pollAndExecCC(ForkJoinPool.java:1190)
at java.util.concurrent.ForkJoinPool.helpComplete(ForkJoinPool.java:1879)
at java.util.concurrent.ForkJoinPool.awaitJoin(ForkJoinPool.java:2045)
at java.util.concurrent.ForkJoinTask.doJoin(ForkJoinTask.java:390)
at java.util.concurrent.ForkJoinTask.join(ForkJoinTask.java:719)
at java.util.concurrent.ForkJoinPool.invoke(ForkJoinPool.java:2616)
at com.intellij.concurrency.JobLauncherImpl.invokeConcurrentlyUnderProgress(JobLauncherImpl.java:65)
at com.intellij.concurrency.JobLauncher.invokeConcurrentlyUnderProgress(JobLauncher.java:56)
at com.intellij.psi.impl.search.PsiSearchHelperImpl.processFilesConcurrentlyDespiteWriteActions(PsiSearchHelperImpl.java:380)
at com.intellij.psi.impl.search.PsiSearchHelperImpl.processPsiFileRoots(PsiSearchHelperImpl.java:303)
at com.intellij.psi.impl.search.PsiSearchHelperImpl.processCandidates(PsiSearchHelperImpl.java:734)
at com.intellij.psi.impl.search.PsiSearchHelperImpl.processGlobalRequestsOptimized(PsiSearchHelperImpl.java:716)
at com.intellij.psi.impl.search.PsiSearchHelperImpl.processRequests(PsiSearchHelperImpl.java:612)
at com.intellij.psi.search.SearchRequestQuery.processResults(SearchRequestQuery.java:31)
at com.intellij.util.AbstractQuery.forEach(AbstractQuery.java:66)
at com.intellij.util.MergeQuery.processSubQuery(MergeQuery.java:70)
at com.intellij.util.MergeQuery.forEach(MergeQuery.java:43)
at com.intellij.util.UniqueResultsQuery.process(UniqueResultsQuery.java:55)
at com.intellij.util.UniqueResultsQuery.forEach(UniqueResultsQuery.java:45)
at org.jetbrains.kotlin.idea.inspections.UnusedSymbolInspection.hasReferences(UnusedSymbolInspection.kt:317)
at org.jetbrains.kotlin.idea.inspections.UnusedSymbolInspection.hasNonTrivialUsages(UnusedSymbolInspection.kt:254)
at org.jetbrains.kotlin.idea.inspections.UnusedSymbolInspection.access$hasNonTrivialUsages(UnusedSymbolInspection.kt:79)
at org.jetbrains.kotlin.idea.inspections.UnusedSymbolInspection$buildVisitor$1.invoke(UnusedSymbolInspection.kt:185)
at org.jetbrains.kotlin.idea.inspections.UnusedSymbolInspection$buildVisitor$1.invoke(UnusedSymbolInspection.kt:79)
at org.jetbrains.kotlin.psi.VisitorWrappersKt$namedDeclarationVisitor$1.visitNamedDeclaration(VisitorWrappers.kt:386)
at org.jetbrains.kotlin.psi.KtVisitorVoid.visitNamedDeclaration(KtVisitorVoid.java:959)
at org.jetbrains.kotlin.psi.KtVisitorVoid.visitNamedDeclaration(KtVisitorVoid.java:21)
at org.jetbrains.kotlin.psi.KtVisitor.visitProperty(KtVisitor.java:57)
at org.jetbrains.kotlin.psi.KtVisitorVoid.visitProperty(KtVisitorVoid.java:53)
at org.jetbrains.kotlin.psi.KtVisitorVoid.visitProperty(KtVisitorVoid.java:489)
at org.jetbrains.kotlin.psi.KtVisitorVoid.visitProperty(KtVisitorVoid.java:21)
at org.jetbrains.kotlin.psi.KtProperty.accept(KtProperty.java:57)
at org.jetbrains.kotlin.psi.KtElementImplStub.accept(KtElementImplStub.java:59)
at com.intellij.codeInspection.InspectionEngine.acceptElements(InspectionEngine.java:75)
at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass.lambda$null$7(LocalInspectionsPass.java:316)
at com.intellij.util.AstLoadingFilter.lambda$toComputable$2(AstLoadingFilter.java:168)
at com.intellij.util.AstLoadingFilter.disallowTreeLoading(AstLoadingFilter.java:126)
at com.intellij.util.AstLoadingFilter.disallowTreeLoading(AstLoadingFilter.java:115)
at com.intellij.util.AstLoadingFilter.disallowTreeLoading(AstLoadingFilter.java:110)
at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass.lambda$visitRestElementsAndCleanup$8(LocalInspectionsPass.java:315)
at com.intellij.concurrency.ApplierCompleter.execAndForkSubTasks(ApplierCompleter.java:133)
at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1166)
at com.intellij.concurrency.ApplierCompleter.lambda$wrapInReadActionAndIndicator$1(ApplierCompleter.java:105)
at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:582)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:532)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:87)
at com.intellij.concurrency.ApplierCompleter.wrapInReadActionAndIndicator(ApplierCompleter.java:116)
at com.intellij.concurrency.ApplierCompleter.lambda$compute$0(ApplierCompleter.java:96)
at com.intellij.openapi.application.impl.ReadMostlyRWLock.executeByImpatientReader(ReadMostlyRWLock.java:147)
at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:222)
at com.intellij.concurrency.ApplierCompleter.compute(ApplierCompleter.java:96)
at java.util.concurrent.CountedCompleter.exec(CountedCompleter.java:731)
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
at java.util.concurrent.ForkJoinPool$WorkQueue.pollAndExecCC(ForkJoinPool.java:1190)
at java.util.concurrent.ForkJoinPool.helpComplete(ForkJoinPool.java:1879)
at java.util.concurrent.ForkJoinPool.awaitJoin(ForkJoinPool.java:2045)
at java.util.concurrent.ForkJoinTask.doJoin(ForkJoinTask.java:390)
at java.util.concurrent.ForkJoinTask.join(ForkJoinTask.java:719)
at java.util.concurrent.ForkJoinPool.invoke(ForkJoinPool.java:2616)
at com.intellij.concurrency.JobLauncherImpl.invokeConcurrentlyUnderProgress(JobLauncherImpl.java:65)
at com.intellij.concurrency.JobLauncher.invokeConcurrentlyUnderProgress(JobLauncher.java:56)
at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass.visitRestElementsAndCleanup(LocalInspectionsPass.java:328)
at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass.inspect(LocalInspectionsPass.java:199)
at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass.collectInformationWithProgress(LocalInspectionsPass.java:115)
at com.intellij.codeInsight.daemon.impl.ProgressableTextEditorHighlightingPass.doCollectInformation(ProgressableTextEditorHighlightingPass.java:84)
at com.intellij.codeHighlighting.TextEditorHighlightingPass.collectInformation(TextEditorHighlightingPass.java:69)
at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$null$1(PassExecutorService.java:423)
at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1171)
at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$doRun$2(PassExecutorService.java:416)
at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:582)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:532)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:87)
at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.doRun(PassExecutorService.java:415)
at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$run$0(PassExecutorService.java:391)
at com.intellij.openapi.application.impl.ReadMostlyRWLock.executeByImpatientReader(ReadMostlyRWLock.java:147)
at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:222)
at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.run(PassExecutorService.java:389)
at com.intellij.concurrency.JobLauncherImpl$VoidForkJoinTask$1.exec(JobLauncherImpl.java:161)
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)