diff --git a/lib/pages/common/multi_select_controller.dart b/lib/pages/common/multi_select_controller.dart
index 6f7dd1e6..37e2325f 100644
--- a/lib/pages/common/multi_select_controller.dart
+++ b/lib/pages/common/multi_select_controller.dart
@@ -18,11 +18,13 @@ abstract class MultiSelectController extends CommonController {
   }
 
   void handleSelect([bool checked = false]) {
-    List? list = (loadingState.value as Success?)?.response;
-    if (list.isNullOrEmpty.not) {
-      loadingState.value = LoadingState.success(
-          list!.map((item) => item..checked = checked).toList());
-      checkedCount.value = checked ? list.length : 0;
+    if (loadingState.value is Success) {
+      List list = (loadingState.value as Success).response;
+      if (list.isNotEmpty) {
+        loadingState.value = LoadingState.success(
+            list.map((item) => item..checked = checked).toList());
+        checkedCount.value = checked ? list.length : 0;
+      }
     }
     if (checked.not) {
       enableMultiSelect.value = false;
diff --git a/lib/pages/common/reply_controller.dart b/lib/pages/common/reply_controller.dart
index 32c89b38..9882061f 100644
--- a/lib/pages/common/reply_controller.dart
+++ b/lib/pages/common/reply_controller.dart
@@ -200,8 +200,9 @@ abstract class ReplyController extends CommonController {
           savedReplies[key] = null;
           if (GlobalData().grpcReply) {
             ReplyInfo replyInfo = Utils.replyCast(res);
-            MainListReply response =
-                (loadingState.value as Success?)?.response ?? MainListReply();
+            MainListReply response = loadingState.value is Success
+                ? (loadingState.value as Success).response
+                : MainListReply();
             if (oid != null) {
               response.replies.insert(hasUpTop ? 1 : 0, replyInfo);
             } else {
@@ -210,8 +211,9 @@ abstract class ReplyController extends CommonController {
             count.value += 1;
             loadingState.value = LoadingState.success(response);
           } else {
-            ReplyData response =
-                (loadingState.value as Success?)?.response ?? ReplyData();
+            ReplyData response = loadingState.value is Success
+                ? (loadingState.value as Success).response
+                : ReplyData();
             response.replies ??= <ReplyItemModel>[];
             if (oid != null) {
               response.replies
diff --git a/lib/pages/history/controller.dart b/lib/pages/history/controller.dart
index d5ea540e..c86c8aba 100644
--- a/lib/pages/history/controller.dart
+++ b/lib/pages/history/controller.dart
@@ -179,9 +179,11 @@ class HistoryController extends MultiSelectController {
             TextButton(
               onPressed: () async {
                 Get.back();
-                _onDelete(((loadingState.value as Success).response as List)
-                    .where((e) => e.checked)
-                    .toList());
+                if (loadingState.value is Success) {
+                  _onDelete(((loadingState.value as Success).response as List)
+                      .where((e) => e.checked)
+                      .toList());
+                }
               },
               child: const Text('确认'),
             )
diff --git a/lib/pages/video/detail/reply_reply/view.dart b/lib/pages/video/detail/reply_reply/view.dart
index edf7b860..d0bc05b7 100644
--- a/lib/pages/video/detail/reply_reply/view.dart
+++ b/lib/pages/video/detail/reply_reply/view.dart
@@ -298,19 +298,19 @@ class _VideoReplyReplyPanelState extends State<VideoReplyReplyPanel> {
         _savedReplies[key] = null;
         if (GlobalData().grpcReply) {
           ReplyInfo replyInfo = Utils.replyCast(res);
-          List list =
-              (_videoReplyReplyController.loadingState.value as Success?)
-                      ?.response ??
-                  <ReplyInfo>[];
+          List list = _videoReplyReplyController.loadingState.value is Success
+              ? (_videoReplyReplyController.loadingState.value as Success)
+                  .response
+              : <ReplyInfo>[];
           list.insert(index + 1, replyInfo);
           _videoReplyReplyController.count.value += 1;
           _videoReplyReplyController.loadingState.value =
               LoadingState.success(list);
         } else {
-          List list =
-              (_videoReplyReplyController.loadingState.value as Success?)
-                      ?.response ??
-                  <ReplyItemModel>[];
+          List list = _videoReplyReplyController.loadingState.value is Success
+              ? (_videoReplyReplyController.loadingState.value as Success)
+                  .response
+              : <ReplyItemModel>[];
           list.insert(index + 1, ReplyItemModel.fromJson(res, ''));
           _videoReplyReplyController.count.value += 1;
           _videoReplyReplyController.loadingState.value =