diff --git a/components/script/dom/document.rs b/components/script/dom/document.rs
index 441993a8e8e..b85366a27d2 100644
--- a/components/script/dom/document.rs
+++ b/components/script/dom/document.rs
@@ -398,7 +398,7 @@ impl Document {
     #[inline]
     pub fn browsing_context(&self) -> Option<Root<BrowsingContext>> {
         if self.has_browsing_context {
-            Some(self.window.browsing_context())
+            self.window.maybe_browsing_context()
         } else {
             None
         }
diff --git a/components/script/dom/window.rs b/components/script/dom/window.rs
index d9095d2c6d5..440b188646e 100644
--- a/components/script/dom/window.rs
+++ b/components/script/dom/window.rs
@@ -319,10 +319,15 @@ impl Window {
         &self.image_cache_thread
     }
 
+    /// This can panic if it is called after the browsing context has been discarded
     pub fn browsing_context(&self) -> Root<BrowsingContext> {
         self.browsing_context.get().unwrap()
     }
 
+    pub fn maybe_browsing_context(&self) -> Option<Root<BrowsingContext>> {
+        self.browsing_context.get()
+    }
+
     pub fn bluetooth_thread(&self) -> IpcSender<BluetoothRequest> {
         self.bluetooth_thread.clone()
     }
@@ -627,7 +632,7 @@ impl WindowMethods for Window {
     // https://html.spec.whatwg.org/multipage/#dom-parent
     fn GetParent(&self) -> Option<Root<BrowsingContext>> {
         // Steps 1. and 2.
-        if self.browsing_context().is_discarded() {
+        if self.maybe_browsing_context().map_or(true, |c| c.is_discarded()) {
             return None;
         }
         match self.parent() {
@@ -641,7 +646,7 @@ impl WindowMethods for Window {
     // https://html.spec.whatwg.org/multipage/#dom-top
     fn GetTop(&self) -> Option<Root<BrowsingContext>> {
         // Steps 1. and 2.
-        if self.browsing_context().is_discarded() {
+        if self.maybe_browsing_context().map_or(true, |c| c.is_discarded()) {
             return None;
         }
         // Step 5.