Exception on indexing

[MaXal]

Environment:
Symfony Support (0.18.176)

Looks like this change produced an exception: 221ad5c#diff-95006303cfc7520c772a1142ad7a2a53

The following exception is thrown:

com.intellij.openapi.project.IndexNotReadyException: Please change caller according to com.intellij.openapi.project.IndexNotReadyException documentation
	at com.intellij.openapi.project.IndexNotReadyException.create(IndexNotReadyException.java:81)
	at com.intellij.util.indexing.FileBasedIndexImpl.handleDumbMode(FileBasedIndexImpl.java:770)
	at com.intellij.util.indexing.FileBasedIndexImpl.ensureUpToDate(FileBasedIndexImpl.java:719)
	at com.intellij.util.indexing.FileBasedIndexImpl.processExceptions(FileBasedIndexImpl.java:893)
	at com.intellij.util.indexing.FileBasedIndexImpl.processValueIterator(FileBasedIndexImpl.java:969)
	at com.intellij.util.indexing.FileBasedIndexImpl.processValuesInScope(FileBasedIndexImpl.java:940)
	at com.intellij.util.indexing.FileBasedIndexImpl.getValues(FileBasedIndexImpl.java:800)
	at com.jetbrains.php.codeInsight.PhpCodeInsightUtil.isPassByRefParameter(PhpCodeInsightUtil.java:1212)
	at com.jetbrains.php.lang.psi.elements.impl.VariableImpl.isWriteAccess(VariableImpl.java:282)
	at com.jetbrains.php.lang.psi.elements.impl.VariableImpl.isWriteAccess(VariableImpl.java:234)
	at com.jetbrains.php.codeInsight.controlFlow.instructions.PhpAccessInstruction$ReadOrReadRefAccess.isReadRef(PhpAccessInstruction.java:200)
	at com.jetbrains.php.codeInsight.controlFlow.instructions.PhpAccessInstruction$ReadOrReadRefAccess.isRead(PhpAccessInstruction.java:205)
	at fr.adrienbrault.idea.symfony2plugin.stubs.indexes.ContainerBuilderStubIndex$MyInstructionProcessor.processAccessVariableInstruction(ContainerBuilderStubIndex.java:170)
	at com.jetbrains.php.codeInsight.controlFlow.instructions.impl.PhpAccessVariableInstructionImpl.process(PhpAccessVariableInstructionImpl.java:33)
	at fr.adrienbrault.idea.symfony2plugin.stubs.indexes.ContainerBuilderStubIndex.processMethod(ContainerBuilderStubIndex.java:147)
	at fr.adrienbrault.idea.symfony2plugin.stubs.indexes.ContainerBuilderStubIndex.lambda$null$1(ContainerBuilderStubIndex.java:79)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
	at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
	at one.util.streamex.AbstractStreamEx.forEach(AbstractStreamEx.java:306)
	at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:274)
	at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177)
	at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
	at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
	at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
	at one.util.streamex.AbstractStreamEx.forEach(AbstractStreamEx.java:314)
	at fr.adrienbrault.idea.symfony2plugin.stubs.indexes.ContainerBuilderStubIndex.lambda$getIndexer$2(ContainerBuilderStubIndex.java:79)
	at com.intellij.util.indexing.impl.MapReduceIndex.mapInput(MapReduceIndex.java:313)
	at com.intellij.util.indexing.VfsAwareMapReduceIndex.mapInput(VfsAwareMapReduceIndex.java:109)
	at com.intellij.util.indexing.impl.MapReduceIndex.calculateUpdateData(MapReduceIndex.java:269)
	at com.intellij.util.indexing.impl.MapReduceIndex.update(MapReduceIndex.java:251)
	at com.intellij.util.indexing.FileBasedIndexImpl.updateSingleIndex(FileBasedIndexImpl.java:1685)
	at com.intellij.util.indexing.FileBasedIndexImpl.lambda$doIndexFileContent$28(FileBasedIndexImpl.java:1615)
	at com.intellij.openapi.fileTypes.impl.FileTypeManagerImpl.freezeFileTypeTemporarilyIn(FileTypeManagerImpl.java:673)
	at com.intellij.util.indexing.FileBasedIndexImpl.doIndexFileContent(FileBasedIndexImpl.java:1574)
	at com.intellij.util.indexing.FileBasedIndexImpl.indexFileContent(FileBasedIndexImpl.java:1561)
	at com.intellij.util.indexing.UnindexedFilesUpdater.lambda$indexFiles$0(UnindexedFilesUpdater.java:109)
	at com.intellij.openapi.project.CacheUpdateRunner$MyRunnable.lambda$run$0(CacheUpdateRunner.java:219)
	at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1106)
	at com.intellij.openapi.project.CacheUpdateRunner$MyRunnable.lambda$run$1(CacheUpdateRunner.java:235)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:169)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:591)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:537)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:59)
	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:156)
	at com.intellij.openapi.project.CacheUpdateRunner$MyRunnable.run(CacheUpdateRunner.java:232)
	at com.intellij.openapi.application.impl.ApplicationImpl$1.run(ApplicationImpl.java:295)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:834