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 2ec17a0ebbfa..82fe0cd0dfec 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
@@ -103,9 +103,11 @@ public class IpnbFilePanel extends JPanel implements Scrollable, DataProvider, D
 
   private void readFromFile(boolean showError) {
     try {
+      IpnbFile file = IpnbParser.parseIpnbFile(myDocument, myVirtualFile);
+      if (file.equals(myIpnbFile)) return;
+      myIpnbFile = file;
       myIpnbPanels.clear();
       mySelectedCell = null;
-      myIpnbFile = IpnbParser.parseIpnbFile(myDocument, myVirtualFile);
       if (myIpnbFile.getCells().isEmpty()) {
         CommandProcessor.getInstance().runUndoTransparentAction(new Runnable() {
           public void run() {