From a9d2330c9c4cd2951072a61de1276ae4b5dec4ef Mon Sep 17 00:00:00 2001
From: "Gregory.Shrago" <gregory.shrago@jetbrains.com>
Date: Wed, 24 Jan 2018 14:42:48 +0300
Subject: [PATCH] do not record undo for already disposed projects

---
 .../com/intellij/lang/PerFileMappingsBase.java    | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/platform/platform-api/src/com/intellij/lang/PerFileMappingsBase.java b/platform/platform-api/src/com/intellij/lang/PerFileMappingsBase.java
index d9894e62954c..639b5572c819 100644
--- a/platform/platform-api/src/com/intellij/lang/PerFileMappingsBase.java
+++ b/platform/platform-api/src/com/intellij/lang/PerFileMappingsBase.java
@@ -294,14 +294,15 @@ public abstract class PerFileMappingsBase<T> implements PersistentStateComponent
       public void before(@NotNull List<? extends VFileEvent> events) {
         if (CommandProcessor.getInstance().isUndoTransparentActionInProgress()) return;
         Project project = CommandProcessor.getInstance().getCurrentCommandProject();
-        UndoManager undoManager = (project != null ? UndoManager.getInstance(project) : UndoManager.getGlobalInstance());
-        if (project == null) return;
+        if (project == null || !project.isOpen()) return;
+
         MyUndoableAction action = createUndoableAction(events);
-        if (action != null) {
-          action.doRemove(action.removed);
-          lastAction = new WeakReference<>(action);
-          undoManager.undoableActionPerformed(action);
-        }
+        if (action == null) return;
+        
+        action.doRemove(action.removed);
+        lastAction = new WeakReference<>(action);
+        
+        UndoManager.getInstance(project).undoableActionPerformed(action);
       }
 
       @Override