NullPointerException calling com.intellij.psi.PsiElement.getReferences()

[wfhartford]

Reported by IntelliJ:

java.lang.NullPointerException: Cannot invoke "com.intellij.psi.PsiElement.getReferences()" because the return value of "com.intellij.psi.PsiElement.getFirstChild()" is null
	at com.faendir.intellij.gradleVersionCatalogs.kotlin.Accessor$Companion.find(Accessor.kt:24)
	at com.faendir.intellij.gradleVersionCatalogs.kotlin.cache.BuildGradleKtsPsiCache$findAccessor$1.invoke(BuildGradleKtsPsiCache.kt:27)
	at com.faendir.intellij.gradleVersionCatalogs.kotlin.cache.BuildGradleKtsPsiCache$findAccessor$1.invoke(BuildGradleKtsPsiCache.kt:27)
	at com.faendir.intellij.gradleVersionCatalogs.kotlin.cache.BuildGradleKtsPsiCache.findAccessor$lambda$1(BuildGradleKtsPsiCache.kt:27)
	at com.intellij.psi.util.CachedValuesManager.lambda$getProjectPsiDependentCache$0(CachedValuesManager.java:134)
	at com.intellij.psi.util.CachedValuesManager$1.compute(CachedValuesManager.java:158)
	at com.intellij.psi.impl.PsiCachedValueImpl.doCompute(PsiCachedValueImpl.java:37)
	at com.intellij.util.CachedValueBase.lambda$getValueWithLock$3(CachedValueBase.java:240)
	at com.intellij.util.CachedValueBase.computeData(CachedValueBase.java:43)
	at com.intellij.util.CachedValueBase.lambda$getValueWithLock$4(CachedValueBase.java:240)
	at com.intellij.openapi.util.RecursionManager$1.computePreventingRecursion(RecursionManager.java:110)
	at com.intellij.openapi.util.RecursionGuard.doPreventingRecursion(RecursionGuard.java:27)
	at com.intellij.openapi.util.RecursionManager.doPreventingRecursion(RecursionManager.java:65)
	at com.intellij.util.CachedValueBase.getValueWithLock(CachedValueBase.java:241)
	at com.intellij.psi.impl.PsiCachedValueImpl.getValue(PsiCachedValueImpl.java:27)
	at com.intellij.util.CachedValuesManagerImpl.getCachedValue(CachedValuesManagerImpl.java:69)
	at com.intellij.psi.util.CachedValuesManager.getCachedValue(CachedValuesManager.java:155)
	at com.intellij.psi.util.CachedValuesManager.getProjectPsiDependentCache(CachedValuesManager.java:132)
	at com.faendir.intellij.gradleVersionCatalogs.kotlin.cache.BuildGradleKtsPsiCache.findAccessor(BuildGradleKtsPsiCache.kt:27)
	at com.faendir.intellij.gradleVersionCatalogs.kotlin.inlayhints.VersionCatalogInlayHintsProvider$getCollectorFor$1.collect(VersionCatalogInlayHintsProvider.kt:37)
	at com.intellij.codeInsight.hints.CollectorWithSettings.collectHints(InlayHintsUtils.kt:91)
	at com.intellij.codeInsight.hints.InlayHintsPass.doCollectInformation$lambda$0(InlayHintsPass.kt:46)
	at com.intellij.concurrency.ApplierCompleter.execAndForkSubTasks(ApplierCompleter.java:142)
	at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1133)
	at com.intellij.concurrency.ApplierCompleter.lambda$wrapInReadActionAndIndicator$1(ApplierCompleter.java:98)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$13(CoreProgressManager.java:604)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:679)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:635)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:603)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:61)
	at com.intellij.concurrency.ApplierCompleter.wrapInReadActionAndIndicator(ApplierCompleter.java:110)
	at com.intellij.concurrency.ApplierCompleter.compute(ApplierCompleter.java:91)
	at java.base/java.util.concurrent.CountedCompleter.exec(CountedCompleter.java:754)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165)

[5peak2me]

@wfhartford Please provide toml file or sample project, This error appears to be caused by the following line. Thanks!

val references = if (element.lastChild.references.mapNotNull(PsiReference::resolve).isEmpty()) {
                element.lastChild.firstChild.references
            } else element.lastChild.references

[wfhartford]

Hi, sorry for the delay. I'm still getting this error, but I never notice it when it happens, only some time after I've been editing the toml file. I wonder if it's caused by the plugin parsing the toml file in an invalid state.

Other than the error reported by IntelliJ, it doesn't seem like this is causing any serious problems. I'm getting all the features I expect from the plugin and not being prevented from doing anything.

[wfhartford]

I've been getting this error again today and haven't been editing the libs.versions.toml file at all. I'm attaching the file; github won't let me attach a .toml file, so I've added .txt to the name.
libs.versions.toml.txt

[5peak2me]

Thanks，I‘ll debug the issue.

[5peak2me]

Would you mind providing the build.gradle(.kts) file?

[wfhartford]

Unfortunately, I can't. This is a multi-module project so there are a handful of build build along with a few proprietary plugins. My employer does not want all those details shared. I'd be happy to answer any questions you might have though.