From 189a2a1c68c6f135ff60d3483bf9d8b88f376cfa Mon Sep 17 00:00:00 2001
From: Ekaterina Tuzova <Ekaterina.Tuzova@jetbrains.com>
Date: Thu, 13 Nov 2014 13:33:08 +0300
Subject: [PATCH] fixed NPE on creating new Ipython notebook

---
 .../plugins/ipnb/editor/panels/IpnbFilePanel.java    | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/python/ipnb/src/org/jetbrains/plugins/ipnb/editor/panels/IpnbFilePanel.java b/python/ipnb/src/org/jetbrains/plugins/ipnb/editor/panels/IpnbFilePanel.java
index 4d45e3efd6a8..27449ef2e931 100644
--- a/python/ipnb/src/org/jetbrains/plugins/ipnb/editor/panels/IpnbFilePanel.java
+++ b/python/ipnb/src/org/jetbrains/plugins/ipnb/editor/panels/IpnbFilePanel.java
@@ -106,7 +106,17 @@ public class IpnbFilePanel extends JPanel implements Scrollable, DataProvider, D
       mySelectedCell = null;
       myIpnbFile = IpnbParser.parseIpnbFile(myDocument, myVirtualFile.getPath());
       if (myIpnbFile.getCells().isEmpty()) {
-        createAndAddCell(true);
+        CommandProcessor.getInstance().runUndoTransparentAction(new Runnable() {
+          public void run() {
+            ApplicationManager.getApplication().runWriteAction(new Runnable() {
+              public void run() {
+                createAndAddCell(true);
+                saveToFile();
+              }
+            });
+          }
+        });
+
       }
     } catch (IOException e) {
       if (showError)