Bug: common NullPointerException in StringTemplate v4 (0.8) plugin in IntelliJ IDEA 2020.3 IDE

[rwperrott]

java.lang.NullPointerException
	at org.antlr.jetbrains.st4plugin.structview.STGroupTemplateDefItemPresentation.getIcon(STGroupTemplateDefItemPresentation.java:68)
	at com.intellij.ide.projectView.PresentationData.updateFrom(PresentationData.java:191)
	at com.intellij.ide.util.treeView.smartTree.TreeElementWrapper.update(TreeElementWrapper.java:42)
	at com.intellij.ide.util.treeView.PresentableNodeDescriptor.getUpdatedPresentation(PresentableNodeDescriptor.java:76)
	at com.intellij.ide.util.treeView.PresentableNodeDescriptor.update(PresentableNodeDescriptor.java:29)
	at com.intellij.ui.tree.StructureTreeModel$Node.update(StructureTreeModel.java:453)
	at com.intellij.ui.tree.StructureTreeModel$Node.<init>(StructureTreeModel.java:435)
	at com.intellij.ui.tree.StructureTreeModel$Node.<init>(StructureTreeModel.java:427)
	at com.intellij.ui.tree.StructureTreeModel.getValidChildren(StructureTreeModel.java:389)
	at com.intellij.ui.tree.StructureTreeModel.validateChildren(StructureTreeModel.java:298)
	at com.intellij.ui.tree.StructureTreeModel.getNode(StructureTreeModel.java:292)
	at com.intellij.ui.tree.StructureTreeModel.getChildren(StructureTreeModel.java:312)
	at com.intellij.ui.tree.AsyncTreeModel$CmdGetChildren.getNode(AsyncTreeModel.java:561)
	at com.intellij.ui.tree.AsyncTreeModel$Command.get(AsyncTreeModel.java:456)
	at com.intellij.ui.tree.AsyncTreeModel$Command.get(AsyncTreeModel.java:422)
	at com.intellij.util.concurrency.Invoker$Task.run(Invoker.java:316)
	at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1137)
	at com.intellij.openapi.progress.util.ProgressIndicatorUtils.lambda$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$2(CoreProgressManager.java:178)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:658)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:610)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:65)
	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:165)
	at com.intellij.openapi.progress.ProgressManager.runProcess(ProgressManager.java:59)
	at com.intellij.openapi.progress.util.ProgressIndicatorUtils.runWithWriteActionPriority(ProgressIndicatorUtils.java:110)
	at com.intellij.openapi.progress.util.ProgressIndicatorUtils.runInReadActionWithWriteActionPriority(ProgressIndicatorUtils.java:76)
	at com.intellij.util.concurrency.Invoker.invokeSafely(Invoker.java:205)
	at com.intellij.util.concurrency.Invoker.lambda$offerSafely$0(Invoker.java:183)
	at com.intellij.util.concurrency.Invoker$Background.lambda$offer$0(Invoker.java:541)
	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.ConcurrencyUtil.runUnderThreadName(ConcurrencyUtil.java:208)
	at com.intellij.util.concurrency.BoundedTaskExecutor$1.run(BoundedTaskExecutor.java:184)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$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)

[rwperrott]

I've install 0.9, and it still occurs.