diff --git a/plugins/org.eclipse.oomph.ui/src/org/eclipse/oomph/ui/HelpSupport.java b/plugins/org.eclipse.oomph.ui/src/org/eclipse/oomph/ui/HelpSupport.java
index 8ea012c..fa3d4dd 100644
--- a/plugins/org.eclipse.oomph.ui/src/org/eclipse/oomph/ui/HelpSupport.java
+++ b/plugins/org.eclipse.oomph.ui/src/org/eclipse/oomph/ui/HelpSupport.java
@@ -97,6 +97,11 @@
       @Override
       public void helpRequested(HelpEvent e)
       {
+        if (shell.isDisposed())
+        {
+          return;
+        }
+
         if (UIUtil.isBrowserAvailable())
         {
           if (dialog.getTray() != null)