diff --git a/Tests/LibWeb/Text/expected/HTML/WindowProxy-Get-after-detaching-from-browsing-context.txt b/Tests/LibWeb/Text/expected/HTML/WindowProxy-Get-after-detaching-from-browsing-context.txt
new file mode 100644
index 0000000000..ff190b46c3
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/HTML/WindowProxy-Get-after-detaching-from-browsing-context.txt
@@ -0,0 +1,3 @@
+ 
+null
+PASS (didn't crash)
diff --git a/Tests/LibWeb/Text/input/HTML/WindowProxy-Get-after-detaching-from-browsing-context.html b/Tests/LibWeb/Text/input/HTML/WindowProxy-Get-after-detaching-from-browsing-context.html
new file mode 100644
index 0000000000..08764cd400
--- /dev/null
+++ b/Tests/LibWeb/Text/input/HTML/WindowProxy-Get-after-detaching-from-browsing-context.html
@@ -0,0 +1,11 @@
+<script src="../include.js"></script>
+<script>
+    test(() => {
+        let iframe = document.querySelector("iframe")
+        let w = iframe.contentWindow;
+        println(w.getSelection());
+        iframe.remove();
+        println(w.getSelection());
+        println("PASS (didn't crash)");
+    })
+</script><iframe></iframe>
diff --git a/Userland/Libraries/LibWeb/HTML/CrossOrigin/Reporting.cpp b/Userland/Libraries/LibWeb/HTML/CrossOrigin/Reporting.cpp
index e308a024d6..6c810bf191 100644
--- a/Userland/Libraries/LibWeb/HTML/CrossOrigin/Reporting.cpp
+++ b/Userland/Libraries/LibWeb/HTML/CrossOrigin/Reporting.cpp
@@ -12,8 +12,16 @@
 namespace Web::HTML {
 
 // https://html.spec.whatwg.org/multipage/origin.html#coop-check-access-report
-void check_if_access_between_two_browsing_contexts_should_be_reported(BrowsingContext const& accessor, BrowsingContext const& accessed, JS::PropertyKey const& property_key, EnvironmentSettingsObject const& environment)
+void check_if_access_between_two_browsing_contexts_should_be_reported(
+    BrowsingContext const& accessor,
+    BrowsingContext const* accessed,
+    JS::PropertyKey const& property_key,
+    EnvironmentSettingsObject const& environment)
 {
+    // FIXME: Spec bug: https://github.com/whatwg/html/issues/10192
+    if (!accessed)
+        return;
+
     // 1. If P is not a cross-origin accessible window property name, then return.
     if (!is_cross_origin_accessible_window_property_name(property_key))
         return;
@@ -27,11 +35,11 @@ void check_if_access_between_two_browsing_contexts_should_be_reported(BrowsingCo
     auto accessor_accessed_relationship = AccessorAccessedRelationship::None;
 
     // 5. If accessed's top-level browsing context's opener browsing context is accessor or an ancestor of accessor, then set accessorAccessedRelationship to accessor is opener.
-    if (auto opener = accessed.top_level_browsing_context()->opener_browsing_context(); opener && (opener == &accessor || opener->is_ancestor_of(accessor)))
+    if (auto opener = accessed->top_level_browsing_context()->opener_browsing_context(); opener && (opener == &accessor || opener->is_ancestor_of(accessor)))
         accessor_accessed_relationship = AccessorAccessedRelationship::AccessorIsOpener;
 
     // 6. If accessor's top-level browsing context's opener browsing context is accessed or an ancestor of accessed, then set accessorAccessedRelationship to accessor is openee.
-    if (auto opener = accessor.top_level_browsing_context()->opener_browsing_context(); opener && (opener == &accessed || opener->is_ancestor_of(accessed)))
+    if (auto opener = accessor.top_level_browsing_context()->opener_browsing_context(); opener && (opener == accessed || opener->is_ancestor_of(*accessed)))
         accessor_accessed_relationship = AccessorAccessedRelationship::AccessorIsOpenee;
 
     // FIXME: 7. Queue violation reports for accesses, given accessorAccessedRelationship, accessor's top-level browsing context's active document's cross-origin opener policy, accessed's top-level browsing context's active document's cross-origin opener policy, accessor's active document's URL, accessed's active document's URL, accessor's top-level browsing context's initial URL, accessed's top-level browsing context's initial URL, accessor's active document's origin, accessed's active document's origin, accessor's top-level browsing context's opener origin at creation, accessed's top-level browsing context's opener origin at creation, accessor's top-level browsing context's active document's referrer, accessed's top-level browsing context's active document's referrer, P, and environment.
diff --git a/Userland/Libraries/LibWeb/HTML/CrossOrigin/Reporting.h b/Userland/Libraries/LibWeb/HTML/CrossOrigin/Reporting.h
index a7729f5751..a1eac67a72 100644
--- a/Userland/Libraries/LibWeb/HTML/CrossOrigin/Reporting.h
+++ b/Userland/Libraries/LibWeb/HTML/CrossOrigin/Reporting.h
@@ -18,6 +18,6 @@ enum class AccessorAccessedRelationship {
     None,
 };
 
-void check_if_access_between_two_browsing_contexts_should_be_reported(BrowsingContext const& accessor, BrowsingContext const& accessed, JS::PropertyKey const&, EnvironmentSettingsObject const&);
+void check_if_access_between_two_browsing_contexts_should_be_reported(BrowsingContext const& accessor, BrowsingContext const* accessed, JS::PropertyKey const&, EnvironmentSettingsObject const&);
 
 }
diff --git a/Userland/Libraries/LibWeb/HTML/WindowProxy.cpp b/Userland/Libraries/LibWeb/HTML/WindowProxy.cpp
index 61f99aec42..46e2e9454d 100644
--- a/Userland/Libraries/LibWeb/HTML/WindowProxy.cpp
+++ b/Userland/Libraries/LibWeb/HTML/WindowProxy.cpp
@@ -158,7 +158,7 @@ JS::ThrowCompletionOr<JS::Value> WindowProxy::internal_get(JS::PropertyKey const
     // 1. Let W be the value of the [[Window]] internal slot of this.
 
     // 2. Check if an access between two browsing contexts should be reported, given the current global object's browsing context, W's browsing context, P, and the current settings object.
-    check_if_access_between_two_browsing_contexts_should_be_reported(*verify_cast<Window>(current_global_object()).browsing_context(), *m_window->browsing_context(), property_key, current_settings_object());
+    check_if_access_between_two_browsing_contexts_should_be_reported(*verify_cast<Window>(current_global_object()).browsing_context(), m_window->browsing_context(), property_key, current_settings_object());
 
     // 3. If IsPlatformObjectSameOrigin(W) is true, then return ? OrdinaryGet(this, P, Receiver).
     // NOTE: this is passed rather than W as OrdinaryGet and CrossOriginGet will invoke the [[GetOwnProperty]] internal method.
@@ -178,7 +178,7 @@ JS::ThrowCompletionOr<bool> WindowProxy::internal_set(JS::PropertyKey const& pro
     // 1. Let W be the value of the [[Window]] internal slot of this.
 
     // 2. Check if an access between two browsing contexts should be reported, given the current global object's browsing context, W's browsing context, P, and the current settings object.
-    check_if_access_between_two_browsing_contexts_should_be_reported(*verify_cast<Window>(current_global_object()).browsing_context(), *m_window->browsing_context(), property_key, current_settings_object());
+    check_if_access_between_two_browsing_contexts_should_be_reported(*verify_cast<Window>(current_global_object()).browsing_context(), m_window->browsing_context(), property_key, current_settings_object());
 
     // 3. If IsPlatformObjectSameOrigin(W) is true, then:
     if (is_platform_object_same_origin(*m_window)) {