diff --git a/Libraries/LibWeb/HTML/Window.cpp b/Libraries/LibWeb/HTML/Window.cpp
index dd0774ee5e..c57ff134a8 100644
--- a/Libraries/LibWeb/HTML/Window.cpp
+++ b/Libraries/LibWeb/HTML/Window.cpp
@@ -221,8 +221,8 @@ WebIDL::ExceptionOr<Window::OpenedWindow> Window::window_open_steps_internal(Str
     }
 
     // 9. Let noopener be the result of getting noopener for window open with sourceDocument, tokenizedFeatures, and urlRecord.
-    // FIXME: Is it safe to assume url_record has a value here?
-    auto no_opener = get_noopener_for_window_open(source_document, tokenized_features, *url_record);
+    // FIXME: Spec bug: https://github.com/whatwg/html/issues/10844
+    auto no_opener = get_noopener_for_window_open(source_document, tokenized_features, url_record.has_value() ? *url_record : URL::URL("about:blank"));
 
     // 10. Remove tokenizedFeatures["noopener"] and tokenizedFeatures["noreferrer"].
     tokenized_features.remove("noopener"sv);
diff --git a/Tests/LibWeb/Text/expected/HTML/Window-open-empty-string.txt b/Tests/LibWeb/Text/expected/HTML/Window-open-empty-string.txt
new file mode 100644
index 0000000000..50586a4cbf
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/HTML/Window-open-empty-string.txt
@@ -0,0 +1 @@
+PASS! (Didn't crash)
diff --git a/Tests/LibWeb/Text/input/HTML/Window-open-empty-string.html b/Tests/LibWeb/Text/input/HTML/Window-open-empty-string.html
new file mode 100644
index 0000000000..c10b55a51b
--- /dev/null
+++ b/Tests/LibWeb/Text/input/HTML/Window-open-empty-string.html
@@ -0,0 +1,7 @@
+<script src="../include.js"></script>
+<script>
+    test(() => {
+        window.open();
+        println("PASS! (Didn't crash)");
+    })
+</script>