diff --git a/platform/testFramework/src/com/intellij/testFramework/PlatformTestCase.java b/platform/testFramework/src/com/intellij/testFramework/PlatformTestCase.java
index 2744a664de96..9dea59c61abe 100644
--- a/platform/testFramework/src/com/intellij/testFramework/PlatformTestCase.java
+++ b/platform/testFramework/src/com/intellij/testFramework/PlatformTestCase.java
@@ -389,11 +389,11 @@ public abstract class PlatformTestCase extends UsefulTestCase implements DataPro
   }
 
   public static void cleanupApplicationCaches(Project project) {
-    UndoManagerImpl globalInstance = (UndoManagerImpl)UndoManager.getGlobalInstance();
-    if (globalInstance != null) {
-      globalInstance.dropHistoryInTests();
-    }
     if (project != null && !project.isDisposed()) {
+      UndoManagerImpl globalInstance = (UndoManagerImpl)UndoManager.getGlobalInstance();
+      if (globalInstance != null) {
+        globalInstance.dropHistoryInTests();
+      }
       ((UndoManagerImpl)UndoManager.getInstance(project)).dropHistoryInTests();
       ((DocumentReferenceManagerImpl)DocumentReferenceManager.getInstance()).cleanupForNextTest();