From 47b987e92fdb91dc89bddcf4c81cf7333339db20 Mon Sep 17 00:00:00 2001
From: Liana Bakradze <liana.bakradze@jetbrains.com>
Date: Thu, 21 Aug 2014 17:30:55 +0400
Subject: [PATCH] navigate to valid task windows only

---
 .../src/com/jetbrains/python/edu/course/TaskFile.java          | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/python/edu/learn-python/src/com/jetbrains/python/edu/course/TaskFile.java b/python/edu/learn-python/src/com/jetbrains/python/edu/course/TaskFile.java
index 0db1a6271dee..5791aa178fe1 100644
--- a/python/edu/learn-python/src/com/jetbrains/python/edu/course/TaskFile.java
+++ b/python/edu/learn-python/src/com/jetbrains/python/edu/course/TaskFile.java
@@ -222,6 +222,9 @@ public class TaskFile implements Stateful {
   }
 
   private void navigateToTaskWindow(@NotNull final Editor editor, @NotNull final TaskWindow firstTaskWindow) {
+    if (!firstTaskWindow.isValid(editor.getDocument())) {
+      return;
+    }
     mySelectedTaskWindow = firstTaskWindow;
     LogicalPosition taskWindowStart = new LogicalPosition(firstTaskWindow.getLine(), firstTaskWindow.getStart());
     editor.getCaretModel().moveToLogicalPosition(taskWindowStart);