Plugin crashes when searching for usage with PHPStorm 2020.3

[mlutonsky]

Just after invoking "Find usage" action (i.e. usage of method) exception always occurs:

Details: Current thread: Thread[ApplicationImpl pooled thread 299,4,Idea Thread Group] 9598186
; dispatch thread: false; isDispatchThread(): false
SystemEventQueueThread: Thread[AWT-EventQueue-0,6,Idea Thread Group] 1412154864

java.lang.Throwable: Read access is allowed from event dispatch thread or inside read-action only (see com.intellij.openapi.application.Application.runReadAction())
	at com.intellij.openapi.diagnostic.Logger.error(Logger.java:177)
	at com.intellij.openapi.application.impl.ApplicationImpl.assertReadAccessAllowed(ApplicationImpl.java:1033)
	at com.intellij.psi.impl.source.PsiFileImpl.assertReadAccessAllowed(PsiFileImpl.java:185)
	at com.intellij.psi.impl.source.PsiFileImpl.getStubTree(PsiFileImpl.java:617)
	at com.intellij.psi.impl.source.PsiFileImpl.getGreenStubTree(PsiFileImpl.java:951)
	at com.intellij.psi.impl.source.SpineRef.getGreenStub(SpineRef.java:39)
	at com.intellij.extapi.psi.StubBasedPsiElementBase.getGreenStub(StubBasedPsiElementBase.java:361)
	at com.jetbrains.php.lang.psi.elements.impl.PhpNamedElementImpl.getName(PhpNamedElementImpl.java:69)
	at cz.juzna.intellij.nette.reference.ComponentReferenceSearch.processQuery(ComponentReferenceSearch.java:24)
	at cz.juzna.intellij.nette.reference.ComponentReferenceSearch.processQuery(ComponentReferenceSearch.java:16)
	at com.intellij.openapi.application.QueryExecutorBase.execute(QueryExecutorBase.java:77)
	at com.intellij.util.ExecutorsQuery.processResults(ExecutorsQuery.java:28)
	at com.intellij.util.AbstractQuery.doProcessResults(AbstractQuery.java:99)
	at com.intellij.util.AbstractQuery.delegateProcessResults(AbstractQuery.java:116)
	at com.intellij.util.MergeQuery.processResults(MergeQuery.java:22)
	at com.intellij.util.AbstractQuery.doProcessResults(AbstractQuery.java:99)
	at com.intellij.util.AbstractQuery.delegateProcessResults(AbstractQuery.java:116)
	at com.intellij.util.UniqueResultsQuery.processResults(UniqueResultsQuery.java:39)
	at com.intellij.util.AbstractQuery.doProcessResults(AbstractQuery.java:99)
	at com.intellij.util.AbstractQuery.forEach(AbstractQuery.java:91)
	at com.jetbrains.php.lang.findUsages.PhpFindUsagesHandler.processElementUsages(PhpFindUsagesHandler.java:91)
	at com.intellij.find.findUsages.FindUsagesManager.lambda$createUsageSearcher$10(FindUsagesManager.java:394)
	at com.intellij.find.findUsages.FindUsagesManager$1.run(FindUsagesManager.java:317)
	at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:962)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcessWithProgressAsync$5(CoreProgressManager.java:472)
	at com.intellij.openapi.progress.impl.ProgressRunner.lambda$submit$3(ProgressRunner.java:235)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:178)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:658)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:610)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:65)
	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:165)
	at com.intellij.openapi.progress.impl.ProgressRunner.lambda$submit$4(ProgressRunner.java:235)
	at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1700)
	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)

PhpStorm 2020.3
Build #PS-203.5981.175, built on December 2, 2020
plugin version v0.4.4