diff --git a/platform/lang-impl/src/com/intellij/codeInsight/documentation/QuickDocOnMouseOverManager.java b/platform/lang-impl/src/com/intellij/codeInsight/documentation/QuickDocOnMouseOverManager.java
index 9fd72fe5b1dc..bd6d5cc1637a 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/documentation/QuickDocOnMouseOverManager.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/documentation/QuickDocOnMouseOverManager.java
@@ -213,6 +213,7 @@ public class QuickDocOnMouseOverManager {
     }
     
     hint.cancel();
+    myDocumentationManager = null;
   }
 
   private static class DelayedQuickDocInfo {