diff -r b72c6db6890b -r 5dc02b23752f tools/assistant/lib/qhelpindexwidget.cpp
--- a/tools/assistant/lib/qhelpindexwidget.cpp	Wed Jun 23 19:07:03 2010 +0300
+++ b/tools/assistant/lib/qhelpindexwidget.cpp	Tue Jul 06 15:10:48 2010 +0300
@@ -244,7 +244,8 @@
         disconnect(this, SLOT(insertIndices()));
     d->indexProvider->stopCollecting();
     d->indices.clear();
-    filter(QString());
+    if (!onShutDown)
+        filter(QString());
 }
 
 /*!