diff --git a/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/LookupImpl.java b/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/LookupImpl.java
index b94259b707a8..e4f5c630c459 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/LookupImpl.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/LookupImpl.java
@@ -940,6 +940,7 @@ public class LookupImpl extends LightweightHint implements LookupEx, Disposable
         @Override
         public void run() {
           assert !myDisposed;
+          if (((CompletionExtender)myList.getExpandableItemsHandler()).isShowing()) return;
           myElementHint = new LookupHint();
           myLayeredPane.add(myElementHint, 20, 0);
           myLayeredPane.layoutHint();