diff --git a/components/script/dom/location.rs b/components/script/dom/location.rs
index 73f7d6f1fe1..69cfb4b7d5b 100644
--- a/components/script/dom/location.rs
+++ b/components/script/dom/location.rs
@@ -43,10 +43,9 @@ impl<'a> LocationMethods for &'a Location {
         // TODO: per spec, we should use the _API base URL_ specified by the
         //       _entry settings object_.
         let base_url = window.get_url();
-        let url = UrlParser::new().base_url(&base_url).parse(&url);
-        // FIXME: handle URL parse errors more gracefully.
-        let url = url.unwrap();
-        window.load_url(url);
+        if let Ok(url) = UrlParser::new().base_url(&base_url).parse(&url) {
+            window.load_url(url);
+        }
     }
 
     // https://url.spec.whatwg.org/#dom-urlutils-hash
diff --git a/tests/wpt/web-platform-tests/html/browsers/history/the-location-interface/location_assign.html b/tests/wpt/web-platform-tests/html/browsers/history/the-location-interface/location_assign.html
index 6f7da1a5332..a2d6e0fb820 100644
--- a/tests/wpt/web-platform-tests/html/browsers/history/the-location-interface/location_assign.html
+++ b/tests/wpt/web-platform-tests/html/browsers/history/the-location-interface/location_assign.html
@@ -15,6 +15,12 @@
       assert_equals((href + "#x"), location.href, "location href");
 
     }, "location assign");
+
+    test(function () {
+      var href = location.href;
+      location.assign("http://:");
+      assert_equals(location.href, href);
+    }, "URL that fails to parse");
     </script>
   </body>
 </html>