Indexing fails on project import

When importing a Pascal project/starting IntelliJ IDEA with a Pascal project open, I get the following error.

Plugin

#!

Version: 1.951

Environment

#!

IntelliJ IDEA 2018.2.5 (Ultimate Edition)
Build #IU-182.4892.20, built on October 16, 2018
JRE: 1.8.0_152-release-1248-b19 x86_64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
macOS 10.12.6

Stacktrace

#!

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:77)
    at com.intellij.util.indexing.FileBasedIndexImpl.handleDumbMode(FileBasedIndexImpl.java:774)
    at com.intellij.util.indexing.FileBasedIndexImpl.ensureUpToDate(FileBasedIndexImpl.java:723)
    at com.intellij.util.indexing.FileBasedIndexImpl.ensureUpToDate(FileBasedIndexImpl.java:706)
    at com.intellij.psi.stubs.StubIndexImpl.doProcessStubs(StubIndexImpl.java:336)
    at com.intellij.psi.stubs.StubIndexImpl.processElements(StubIndexImpl.java:312)
    at com.intellij.psi.stubs.StubIndex.getElements(StubIndex.java:145)
    at com.intellij.psi.stubs.StubIndex.getElements(StubIndex.java:134)
    at com.siberika.idea.pascal.lang.references.ResolveUtil.findUnitsWithStub(ResolveUtil.java:84)
    at com.siberika.idea.pascal.lang.psi.impl.PascalModuleImpl.addUnits(PascalModuleImpl.java:224)
    at com.siberika.idea.pascal.lang.psi.impl.PascalModuleImpl.getPublicUnits(PascalModuleImpl.java:211)
    at com.siberika.idea.pascal.lang.references.PasReferenceUtil.addFirstNamespaces(PasReferenceUtil.java:627)
    at com.siberika.idea.pascal.lang.references.PasReferenceUtil.resolve(PasReferenceUtil.java:395)
    at com.siberika.idea.pascal.lang.references.PasReferenceUtil.resolveTypeScope(PasReferenceUtil.java:322)
    at com.siberika.idea.pascal.lang.psi.impl.PasStubStructTypeImpl.addDefaultScopes(PasStubStructTypeImpl.java:391)
    at com.siberika.idea.pascal.lang.psi.impl.PasStubStructTypeImpl.calcParentScopes(PasStubStructTypeImpl.java:349)
    at com.siberika.idea.pascal.lang.psi.impl.PasStubStructTypeImpl.getParentScope(PasStubStructTypeImpl.java:320)
    at com.siberika.idea.pascal.ide.actions.GotoSuper.retrieveParentInterfaces(GotoSuper.java:89)
    at com.siberika.idea.pascal.lang.psi.impl.PascalNamedStubElement.isLocal(PascalNamedStubElement.java:140)
    at com.siberika.idea.pascal.lang.stub.PasExportedRoutineStubElementType.createStub(PasExportedRoutineStubElementType.java:50)
    at com.siberika.idea.pascal.lang.stub.PasExportedRoutineStubElementType.createStub(PasExportedRoutineStubElementType.java:26)
    at com.intellij.psi.stubs.DefaultStubBuilder$StubBuildingWalkingVisitor.createStub(DefaultStubBuilder.java:113)
    at com.intellij.psi.stubs.DefaultStubBuilder$StubBuildingWalkingVisitor.visitNode(DefaultStubBuilder.java:88)
    at com.intellij.psi.stubs.DefaultStubBuilder$StubBuildingWalkingVisitor.buildStubTree(DefaultStubBuilder.java:83)
    at com.intellij.psi.stubs.DefaultStubBuilder.buildStubTreeFor(DefaultStubBuilder.java:58)
    at com.intellij.psi.stubs.DefaultStubBuilder.buildStubTree(DefaultStubBuilder.java:39)
    at com.intellij.psi.stubs.StubTreeBuilder.buildStubTree(StubTreeBuilder.java:84)
    at com.intellij.psi.stubs.StubUpdatingIndex$3.lambda$map$0(StubUpdatingIndex.java:232)
    at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:925)
    at com.intellij.psi.stubs.StubUpdatingIndex$3.map(StubUpdatingIndex.java:214)
    at com.intellij.psi.stubs.StubUpdatingIndex$3.map(StubUpdatingIndex.java:197)
    at com.intellij.util.indexing.impl.MapReduceIndex.mapInput(MapReduceIndex.java:273)
    at com.intellij.util.indexing.VfsAwareMapReduceIndex.calculateUpdateData(VfsAwareMapReduceIndex.java:97)
    at com.intellij.util.indexing.impl.MapReduceIndex.update(MapReduceIndex.java:213)
    at com.intellij.util.indexing.FileBasedIndexImpl.updateSingleIndex(FileBasedIndexImpl.java:1668)
    at com.intellij.util.indexing.FileBasedIndexImpl.lambda$doIndexFileContent$25(FileBasedIndexImpl.java:1596)
    at com.intellij.openapi.fileTypes.impl.FileTypeManagerImpl.freezeFileTypeTemporarilyIn(FileTypeManagerImpl.java:519)
    at com.intellij.util.indexing.FileBasedIndexImpl.doIndexFileContent(FileBasedIndexImpl.java:1555)
    at com.intellij.util.indexing.FileBasedIndexImpl.indexFileContent(FileBasedIndexImpl.java:1543)
    at com.intellij.util.indexing.UnindexedFilesUpdater.lambda$indexFiles$0(UnindexedFilesUpdater.java:110)
    at com.intellij.openapi.project.CacheUpdateRunner$MyRunnable.lambda$run$0(CacheUpdateRunner.java:230)
    at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1161)
    at com.intellij.openapi.project.CacheUpdateRunner$MyRunnable.lambda$run$1(CacheUpdateRunner.java:246)
    at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$1(CoreProgressManager.java:157)
    at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:580)
    at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:525)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:85)
    at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:144)
    at com.intellij.openapi.project.CacheUpdateRunner$MyRunnable.run(CacheUpdateRunner.java:243)
    at com.intellij.openapi.application.impl.ApplicationImpl$1.run(ApplicationImpl.java:314)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

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