diff --git a/public/dart/fuchsia_scenic_flutter/lib/src/child_view_connection.dart b/public/dart/fuchsia_scenic_flutter/lib/src/child_view_connection.dart
index a3a6b34..b926b31 100644
--- a/public/dart/fuchsia_scenic_flutter/lib/src/child_view_connection.dart
+++ b/public/dart/fuchsia_scenic_flutter/lib/src/child_view_connection.dart
@@ -157,8 +157,8 @@
     if (shared.globalViewContainer == null) {
       return;
     }
-    assert(_attached);
     assert(_viewHolderToken.value.isValid);
+    assert(_attached);
     assert(_viewKey == null);
     assert(!_available);
     assert(_sceneHost == null);
@@ -227,10 +227,8 @@
     if (shared.globalViewContainer == null) {
       return;
     }
-    assert(_viewHolderToken != null);
-    assert(_viewHolderToken.value != null);
-    assert(!_attached);
     assert(!_viewHolderToken.value.isValid);
+    assert(!_attached);
     assert(_viewKey != null);
     assert(_sceneHost != null);
     assert(ViewContainerListenerImpl.instance.getConnectionForKey(_viewKey) ==
diff --git a/public/dart/zircon/lib/src/handle_wrapper.dart b/public/dart/zircon/lib/src/handle_wrapper.dart
index 3a3e603..1f701c5 100644
--- a/public/dart/zircon/lib/src/handle_wrapper.dart
+++ b/public/dart/zircon/lib/src/handle_wrapper.dart
@@ -11,7 +11,7 @@
   _HandleWrapper(this._handle);
 
   Handle get handle => _handle;
-  bool get isValid => handle?.isValid;
+  bool get isValid => handle?.isValid ?? false;
 
   void close() {
     _handle.close();