diff --git a/java/java-impl/src/com/intellij/refactoring/copy/CopyClassesHandler.java b/java/java-impl/src/com/intellij/refactoring/copy/CopyClassesHandler.java
index 1d33a133626b..50d158d41084 100644
--- a/java/java-impl/src/com/intellij/refactoring/copy/CopyClassesHandler.java
+++ b/java/java-impl/src/com/intellij/refactoring/copy/CopyClassesHandler.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2009 JetBrains s.r.o.
+ * Copyright 2000-2011 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -158,7 +158,7 @@ public class CopyClassesHandler implements CopyHandlerDelegate {
   public void doClone(PsiElement element) {
     FeatureUsageTracker.getInstance().triggerFeatureUsed("refactoring.copyClass");
     PsiClass[] classes = getTopLevelClasses(element);
-    LOG.assertTrue(classes != null && classes.length == 1);
+    LOG.assertTrue(classes != null && classes.length == 1, Arrays.toString(classes));
     Project project = element.getProject();
 
     CopyClassDialog dialog = new CopyClassDialog(classes[0], null, project, true);