diff --git a/build_release.dart b/build_release.dart
index 79482a0b..628cd850 100644
--- a/build_release.dart
+++ b/build_release.dart
@@ -30,7 +30,7 @@ String dartExecutable = 'dart';
 void main(List<String> arguments) async {
   var parser = ArgParser()
     ..addOption("target",
-        allowed: ['android', 'windows', 'aab', 'linux'],
+        allowed: ['android', 'android-armv8', 'windows', 'aab', 'linux'],
         help: "The target to build for.",
         mandatory: true)
     ..addOption("versionCode",
@@ -83,6 +83,9 @@ void main(List<String> arguments) async {
     case 'android':
       await buildAndroid(versionCode, gitHash);
       break;
+    case 'android-armv8':
+      await buildAndroid(versionCode, gitHash, target: 'android-arm64');
+      break;
     case 'windows':
       await buildWindows(versionCode, gitHash);
       break;
@@ -111,13 +114,14 @@ Future<int> runDartProcess(List<String> args) async {
   return await buildProcess.exitCode;
 }
 
-Future<void> buildAndroid(String? versionCode, String gitHash) async {
+Future<void> buildAndroid(String? versionCode, String gitHash, {String? target}) async {
   print('Build for Android...');
   await runFlutterProcess([
     'build',
     'apk',
     '--release',
     '--dart-define=GIT_HASH=$gitHash',
+    if (target != null) '--target-platform=$target',
   ]);
 
   print('Clean old files...');
diff --git a/lib/page/forum/hole_detail.dart b/lib/page/forum/hole_detail.dart
index 119f415d..e7496f51 100644
--- a/lib/page/forum/hole_detail.dart
+++ b/lib/page/forum/hole_detail.dart
@@ -891,19 +891,22 @@ class BBSPostDetailState extends State<BBSPostDetail> {
         },
         child: Text(S.of(context).share_floor),
       ),
-      PlatformContextMenuItem(
-        menuContext: menuContext,
-        onPressed: () async {
-          setState(() {
-            if ((_renderModel as Normal).selectedPerson != null) {
-              (_renderModel as Normal).selectedPerson = null;
-            } else {
-              (_renderModel as Normal).selectedPerson = e.anonyname;
-            }
-          });
-        },
-        child: Text((_renderModel as Normal).selectedPerson != null ? S.of(context).show_all_replies : S.of(context).show_this_person),
-      ),
+      if (_renderModel
+          case Normal(selectedPerson: var selectedPerson, hole: _)) ...[
+        PlatformContextMenuItem(
+          menuContext: menuContext,
+          onPressed: () async {
+            setState(() {
+              var model = _renderModel as Normal;
+              model.selectedPerson =
+                  model.selectedPerson != null ? null : e.anonyname;
+            });
+          },
+          child: Text(selectedPerson != null
+              ? S.of(context).show_all_replies
+              : S.of(context).show_this_person),
+        ),
+      ],
       PlatformContextMenuItem(
         menuContext: menuContext,
         isDestructive: true,