1 files changed, 3 insertions, 2 deletions
diff --git a/platform/lang-impl/src/com/intellij/util/indexing/containers/ChangeBufferingList.java b/platform/lang-impl/src/com/intellij/util/indexing/containers/ChangeBufferingList.java
index 77c5b50581ea..103f7d5fb587 100644
--- a/platform/lang-impl/src/com/intellij/util/indexing/containers/ChangeBufferingList.java
+++ b/platform/lang-impl/src/com/intellij/util/indexing/containers/ChangeBufferingList.java
@@ -255,8 +255,9 @@ public class ChangeBufferingList implements Cloneable {
     if (intContainer == null && removals == 0) {
       ValueContainer.IntIterator iterator = new ChangesIterator(changes, length);
       if (DEBUG) {
-        iterator = SortedFileIdSetIterator.getTransientIterator(iterator);
-        DebugAssertions.assertTrue(iterator.size() == length);
+        ValueContainer.IntIterator iteratorSurelyWithoutDupes = SortedFileIdSetIterator.getTransientIterator(iterator);
+        DebugAssertions.assertTrue(iteratorSurelyWithoutDupes.size() == length);
+        iterator = iterator.createCopyInInitialState();
       }
       return iterator;
     }