diff --git a/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/CompletionPreview.java b/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/CompletionPreview.java
index d9cc257fcb9b..bfdb97a69df8 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/CompletionPreview.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/CompletionPreview.java
@@ -100,7 +100,7 @@ public class CompletionPreview {
   
   public static void installPreview(LookupImpl lookup) {
     LookupElement item = lookup.getCurrentItem();
-    if (item == null) {
+    if (item == null || !(lookup.getEditor() instanceof EditorImpl)) {
       return;
     }