fix type error in web builds (#61556)

5e1635b1 · Jonah Williams · GitHub · d8b6fa15 · 5e1635b1
Unverified Commit 5e1635b1 authored Jul 15, 2020 by Jonah Williams Committed by GitHub Jul 15, 2020
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_platform_web.dart packages/flutter/lib/src/foundation/_platform_web.dart +1 -1

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--- a/packages/flutter/lib/src/foundation/_platform_web.dart
+++ b/packages/flutter/lib/src/foundation/_platform_web.dart
@@ -17,7 +17,7 @@ platform.TargetPlatform get defaultTargetPlatform {
 }

 platform.TargetPlatform _browserPlatform() {
-  final String navigatorPlatform = html.window.navigator.platform.toLowerCase();
+  final String navigatorPlatform = html.window.navigator.platform?.toLowerCase() ?? '';
  if (navigatorPlatform.startsWith('mac')) {
    return platform.TargetPlatform.macOS;
  }