diff --git a/components/script/script_runtime.rs b/components/script/script_runtime.rs
index 4cf2055c649..a0a771941b2 100644
--- a/components/script/script_runtime.rs
+++ b/components/script/script_runtime.rs
@@ -206,7 +206,12 @@ unsafe extern "C" fn enqueue_promise_job(
let mut result = false;
wrap_panic(&mut || {
let microtask_queue = &*(extra as *const MicrotaskQueue);
- let global = GlobalScope::from_object(incumbent_global.get());
+ let global = if !incumbent_global.is_null() {
+ GlobalScope::from_object(incumbent_global.get())
+ } else {
+ let realm = AlreadyInRealm::assert_for_cx(cx);
+ GlobalScope::from_context(*cx, InRealm::in_realm(&realm))
+ };
let pipeline = global.pipeline_id();
let interaction = if promise.get().is_null() {
PromiseUserInputEventHandlingState::DontCare
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 47ba62031be..18daac8b040 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -14215,6 +14215,13 @@
{}
]
],
+ "promise-no-incumbent.html": [
+ "a5458d096b5da8d6619ef5c553f232261887f45a",
+ [
+ null,
+ {}
+ ]
+ ],
"promise.html": [
"5925047287175f291c07ee88075359ed92a86e6a",
[
diff --git a/tests/wpt/mozilla/tests/mozilla/promise-no-incumbent.html b/tests/wpt/mozilla/tests/mozilla/promise-no-incumbent.html
new file mode 100644
index 00000000000..a5458d096b5
--- /dev/null
+++ b/tests/wpt/mozilla/tests/mozilla/promise-no-incumbent.html
@@ -0,0 +1,12 @@
+
+
+
+
+