Check for the presence of a window when working with event handlers forwarded to the window

components/script/dom/document.rs

@@ -366,6 +366,9 @@ impl Document {
         self.loader.borrow_mut()
     }
 
+    #[inline]
+    pub fn has_browsing_context(&self) -> bool { self.has_browsing_context }
+
     /// https://html.spec.whatwg.org/multipage/#concept-document-bc
     #[inline]
     pub fn browsing_context(&self) -> Option<Root<BrowsingContext>> {

components/script/dom/htmlframesetelement.rs

@@ -10,7 +10,7 @@ use dom::bindings::js::Root;
 use dom::bindings::str::DOMString;
 use dom::document::Document;
 use dom::htmlelement::HTMLElement;
-use dom::node::{Node, window_from_node};
+use dom::node::{Node, document_from_node, window_from_node};
 use html5ever_atoms::LocalName;
 
 #[dom_struct]

components/script/dom/macros.rs

@@ -354,12 +354,18 @@ macro_rules! define_event_handler(
 macro_rules! define_window_owned_event_handler(
     ($handler: ident, $event_type: ident, $getter: ident, $setter: ident) => (
         fn $getter(&self) -> Option<::std::rc::Rc<$handler>> {
+            if document_from_node(self).has_browsing_context() {
                 window_from_node(self).$getter()
+            } else {
+                None
+            }
         }
 
         fn $setter(&self, listener: Option<::std::rc::Rc<$handler>>) {
+            if document_from_node(self).has_browsing_context() {
                 window_from_node(self).$setter(listener)
             }
+        }
     )
 );