Different word scanner instances should be used for different threads

[carymrobbins]

com.intellij.diagnostic.PluginException: Different word scanner instances should be used for different threads, make sure that com.intellij.lang.cacheBuilder.DefaultWordsScanner@27e81fad with FlexAdapter for com.haskforce.highlighting._HaskellSyntaxHighlightingLexer is instantiated on every request and not shared [Plugin: com.haskforce]
	at com.intellij.ide.plugins.PluginManagerCore.createPluginException(PluginManagerCore.java:403)
	at com.intellij.diagnostic.PluginProblemReporterImpl.createPluginExceptionByClass(PluginProblemReporterImpl.java:12)
	at com.intellij.diagnostic.PluginException.createByClass(PluginException.java:69)
	at com.intellij.lang.cacheBuilder.DefaultWordsScanner.processWords(DefaultWordsScanner.java:95)
	at com.intellij.psi.impl.cache.impl.id.ScanningIdIndexer.map(ScanningIdIndexer.java:29)
	at com.intellij.psi.impl.cache.impl.id.ScanningIdIndexer.map(ScanningIdIndexer.java:19)
	at com.intellij.psi.impl.cache.impl.id.IdIndex$3.map(IdIndex.java:83)
	at com.intellij.psi.impl.cache.impl.id.IdIndex$3.map(IdIndex.java:77)
	at com.intellij.util.indexing.impl.MapReduceIndex.mapInput(MapReduceIndex.java:313)
	at com.intellij.util.indexing.VfsAwareMapReduceIndex.mapInput(VfsAwareMapReduceIndex.java:108)
	at com.intellij.util.indexing.impl.MapReduceIndex.calculateUpdateData(MapReduceIndex.java:269)
	at com.intellij.util.indexing.impl.MapReduceIndex.update(MapReduceIndex.java:251)
	at com.intellij.util.indexing.FileBasedIndexImpl.updateSingleIndex(FileBasedIndexImpl.java:1673)
	at com.intellij.util.indexing.FileBasedIndexImpl.lambda$doIndexFileContent$28(FileBasedIndexImpl.java:1603)
	at com.intellij.openapi.fileTypes.impl.FileTypeManagerImpl.freezeFileTypeTemporarilyIn(FileTypeManagerImpl.java:634)
	at com.intellij.util.indexing.FileBasedIndexImpl.doIndexFileContent(FileBasedIndexImpl.java:1562)
	at com.intellij.util.indexing.FileBasedIndexImpl.indexFileContent(FileBasedIndexImpl.java:1549)
	at com.intellij.util.indexing.UnindexedFilesUpdater.lambda$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$1.run(ApplicationImpl.java:294)
	at java.base/java.util.concurrent.Executors$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)