diff --git a/dev/benchmarks/macrobenchmarks/lib/src/web/recorder.dart b/dev/benchmarks/macrobenchmarks/lib/src/web/recorder.dart
index 89661d6dda..1451d233dc 100644
--- a/dev/benchmarks/macrobenchmarks/lib/src/web/recorder.dart
+++ b/dev/benchmarks/macrobenchmarks/lib/src/web/recorder.dart
@@ -287,7 +287,7 @@ abstract class SceneBuilderRecorder extends Recorder {
         if (shouldContinue()) {
           PlatformDispatcher.instance.scheduleFrame();
         } else {
-          profileCompleter.complete(_profile);
+          profileCompleter.complete(_profile!);
         }
       } catch (error, stackTrace) {
         profileCompleter.completeError(error, stackTrace);
diff --git a/packages/flutter/lib/src/material/scaffold.dart b/packages/flutter/lib/src/material/scaffold.dart
index 8967e74820..1f90b7d37a 100644
--- a/packages/flutter/lib/src/material/scaffold.dart
+++ b/packages/flutter/lib/src/material/scaffold.dart
@@ -2351,6 +2351,10 @@ class ScaffoldState extends State<Scaffold> with TickerProviderStateMixin, Resto
       if (animationController.status != AnimationStatus.dismissed) {
         _dismissedBottomSheets.add(bottomSheet);
       }
+      // TODO(srawlins): Ensure that this Completer has a nullable type (or more
+      // likely, `void`).
+      // https://github.com/flutter/flutter/issues/137294).
+      // ignore: null_argument_to_non_null_type
       completer.complete();
     }