diff -r 4a93f2679691 -r 86aabecda7a3 boot/src/main/java/org/apidesign/html/boot/impl/FnContext.java
--- a/boot/src/main/java/org/apidesign/html/boot/impl/FnContext.java	Tue Nov 05 23:06:32 2013 +0100
+++ b/boot/src/main/java/org/apidesign/html/boot/impl/FnContext.java	Wed Nov 06 15:15:54 2013 +0100
@@ -32,16 +32,16 @@
 public final class FnContext implements Closeable {
     private static final Logger LOG = Logger.getLogger(FnContext.class.getName());
 
-    private Fn.Presenter prev;
+    private Object prev;
     private FnContext(Fn.Presenter p) {
         this.prev = p;
     }
 
     @Override
     public void close() throws IOException {
-        if (prev != null) {
-            currentPresenter(prev);
-            prev = null;
+        if (prev != this) {
+            currentPresenter((Fn.Presenter)prev);
+            prev = this;
         }
     }
 /*