Exception in I-Pascal (2.80) with latest IntelliJ IDEA (2020.3.2)

[Former user]

In IntelliJ IDEA 2020.3.2 (Ultimate Edition), Build #IU-203.7148.57, Runtime version 11.0.9.1+11-b1145.77 amd64, VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o, I get this Exception in I-Pascal (2.80):

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:67) at com.intellij.util.indexing.FileBasedIndexImpl.handleDumbMode(FileBasedIndexImpl.java:756) at com.intellij.util.indexing.FileBasedIndexImpl.ensureUpToDate(FileBasedIndexImpl.java:708) at com.intellij.psi.stubs.StubIndexImpl.getContainingIds(StubIndexImpl.java:465) at com.intellij.psi.stubs.StubIndexImpl.processElements(StubIndexImpl.java:298) at com.intellij.psi.stubs.StubIndex.processElements(StubIndex.java:49) at com.siberika.idea.pascal.PascalFileIconProvider.getIcon(PascalFileIconProvider.java:30) at com.intellij.util.IconUtil.getProvidersIcon(IconUtil.java:221) at com.intellij.util.IconUtil.computeFileIcon(IconUtil.java:154) at com.intellij.openapi.fileEditor.impl.EditorsSplitters.lambda$updateFileIconAsynchronously$5(EditorsSplitters.java:400) at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$Submission.insideReadAction(NonBlockingReadActionImpl.java:521) at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$Submission.lambda$attemptComputation$3(NonBlockingReadActionImpl.java:468) at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1137) at com.intellij.openapi.progress.util.ProgressIndicatorUtils.lambda$runInReadActionWithWriteActionPriority$0(ProgressIndicatorUtils.java:76) at com.intellij.openapi.progress.util.ProgressIndicatorUtils.runActionAndCancelBeforeWrite(ProgressIndicatorUtils.java:152) at com.intellij.openapi.progress.util.ProgressIndicatorUtils.lambda$runWithWriteActionPriority$1(ProgressIndicatorUtils.java:113) at com.intellij.openapi.progress.ProgressManager.lambda$runProcess$0(ProgressManager.java:59) at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:178) at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:658) at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:610) at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:65) at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:165) at com.intellij.openapi.progress.ProgressManager.runProcess(ProgressManager.java:59) at com.intellij.openapi.progress.util.ProgressIndicatorUtils.runWithWriteActionPriority(ProgressIndicatorUtils.java:110) at com.intellij.openapi.progress.util.ProgressIndicatorUtils.runInReadActionWithWriteActionPriority(ProgressIndicatorUtils.java:76) at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$Submission.attemptComputation(NonBlockingReadActionImpl.java:486) at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$Submission.lambda$transferToBgThread$1(NonBlockingReadActionImpl.java:408) at com.intellij.util.concurrency.BoundedTaskExecutor.doRun(BoundedTaskExecutor.java:216) at com.intellij.util.concurrency.BoundedTaskExecutor.access$200(BoundedTaskExecutor.java:27) at com.intellij.util.concurrency.BoundedTaskExecutor$1.execute(BoundedTaskExecutor.java:195) at com.intellij.util.concurrency.BoundedTaskExecutor$1.run(BoundedTaskExecutor.java:187) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:668) at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:665) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:665) at java.base/java.lang.Thread.run(Thread.java:834)