From fdac4892a4f657ce89b3ac873b84f4477a7fa141 Mon Sep 17 00:00:00 2001
From: Anton Makeev <Anton.Makeev@jetbrains.com>
Date: Mon, 5 Dec 2011 13:55:03 +0100
Subject: [PATCH] Document: npe in assertion fixed

---
 .../com/intellij/openapi/editor/impl/DocumentImpl.java   | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/platform/core-impl/src/com/intellij/openapi/editor/impl/DocumentImpl.java b/platform/core-impl/src/com/intellij/openapi/editor/impl/DocumentImpl.java
index 516e55c21d6c..023b104585af 100644
--- a/platform/core-impl/src/com/intellij/openapi/editor/impl/DocumentImpl.java
+++ b/platform/core-impl/src/com/intellij/openapi/editor/impl/DocumentImpl.java
@@ -526,9 +526,12 @@ public class DocumentImpl extends UserDataHolderBase implements DocumentEx {
 
   @NotNull
   private DocumentEvent doBeforeChangedUpdate(int offset, CharSequence oldString, CharSequence newString, boolean wholeTextReplaced) {
-    VirtualFile file = FileDocumentManager.getInstance().getFile(this);
-    if (file != null && !file.isValid()) {
-      LOG.error("File of this document has been deleted.");
+    FileDocumentManager manager = FileDocumentManager.getInstance();
+    if (manager != null) {
+      VirtualFile file = manager.getFile(this);
+      if (file != null && !file.isValid()) {
+        LOG.error("File of this document has been deleted.");
+      }
     }
 
     DocumentEvent event = new DocumentEventImpl(this, offset, oldString, newString, myModificationStamp, wholeTextReplaced);