diff --git a/Packages/vChewing_Shared/Sources/Shared/Protocols/IMEStateProtocol.swift b/Packages/vChewing_Shared/Sources/Shared/Protocols/IMEStateProtocol.swift
index 497df872..ba4ed5dd 100644
--- a/Packages/vChewing_Shared/Sources/Shared/Protocols/IMEStateProtocol.swift
+++ b/Packages/vChewing_Shared/Sources/Shared/Protocols/IMEStateProtocol.swift
@@ -11,7 +11,7 @@ import Cocoa
 // 所有 IMEState 均遵守該協定：
 public protocol IMEStateProtocol {
   var type: StateType { get }
-  var data: IMEStateDataProtocol { get }
+  var data: IMEStateDataProtocol { get set }
   var isASCIIMode: Bool { get set }
   var isVerticalTyping: Bool { get set }
   var isVerticalCandidateWindow: Bool { get set }
diff --git a/Source/Modules/InputHandler_HandleInput.swift b/Source/Modules/InputHandler_HandleInput.swift
index e043ea5d..db236c5d 100644
--- a/Source/Modules/InputHandler_HandleInput.swift
+++ b/Source/Modules/InputHandler_HandleInput.swift
@@ -207,6 +207,17 @@ extension InputHandler {
             delegate.callError("17446655")
           }
           return true
+        } else {
+          let errorMessage =
+            NSLocalizedString(
+              "Please manually implement the symbols of this menu \nin the user phrase file with “_punctuation_list” key.",
+              comment: ""
+            )
+          vCLog("8EB3FB1A: " + errorMessage)
+          delegate.switchState(IMEState.ofEmpty())
+          let isJIS: Bool = input.keyCode == KeyCode.kSymbolMenuPhysicalKeyJIS.rawValue
+          delegate.switchState(IMEState.ofCommitting(textToCommit: isJIS ? "_" : "`"))
+          return true
         }
       } else {
         // 得在這裡先 commit buffer，不然會導致「在摁 ESC 離開符號選單時會重複輸入上一次的組字區的內容」的不當行為。
diff --git a/Source/Resources/Base.lproj/Localizable.strings b/Source/Resources/Base.lproj/Localizable.strings
index d185c4fa..d89e6be6 100644
--- a/Source/Resources/Base.lproj/Localizable.strings
+++ b/Source/Resources/Base.lproj/Localizable.strings
@@ -1,4 +1,5 @@
 "vChewing" = "vChewing";
+"Please manually implement the symbols of this menu \nin the user phrase file with “_punctuation_list” key." = "Please manually implement the symbols of this menu \nin the user phrase file with “_punctuation_list” key.";
 "Wildcard key cannot be the initial key." = "Wildcard key cannot be the initial key.";
 "CIN Cassette Mode" = "CIN Cassette Mode";
 "Invalid Selection Keys." = "Invalid Selection Keys.";
diff --git a/Source/Resources/en.lproj/Localizable.strings b/Source/Resources/en.lproj/Localizable.strings
index d185c4fa..d89e6be6 100644
--- a/Source/Resources/en.lproj/Localizable.strings
+++ b/Source/Resources/en.lproj/Localizable.strings
@@ -1,4 +1,5 @@
 "vChewing" = "vChewing";
+"Please manually implement the symbols of this menu \nin the user phrase file with “_punctuation_list” key." = "Please manually implement the symbols of this menu \nin the user phrase file with “_punctuation_list” key.";
 "Wildcard key cannot be the initial key." = "Wildcard key cannot be the initial key.";
 "CIN Cassette Mode" = "CIN Cassette Mode";
 "Invalid Selection Keys." = "Invalid Selection Keys.";
diff --git a/Source/Resources/ja.lproj/Localizable.strings b/Source/Resources/ja.lproj/Localizable.strings
index 82a71b21..321fa9e3 100644
--- a/Source/Resources/ja.lproj/Localizable.strings
+++ b/Source/Resources/ja.lproj/Localizable.strings
@@ -1,4 +1,5 @@
 "vChewing" = "威注音入力アプリ";
+"Please manually implement the symbols of this menu \nin the user phrase file with “_punctuation_list” key." = "このメニューのお用いには、ご自分でユーザー辞書で\n「_punctuation_list」キーの符号記録のご補充が必要でござる。";
 "Wildcard key cannot be the initial key." = "骨牌キーは最初のキーとしてはならぬ。";
 "CIN Cassette Mode" = "CIN カセットモード";
 "Invalid Selection Keys." = "候補用キーによる不具合。";
diff --git a/Source/Resources/zh-Hans.lproj/Localizable.strings b/Source/Resources/zh-Hans.lproj/Localizable.strings
index fba927d0..f6f4f45c 100644
--- a/Source/Resources/zh-Hans.lproj/Localizable.strings
+++ b/Source/Resources/zh-Hans.lproj/Localizable.strings
@@ -1,4 +1,5 @@
 "vChewing" = "威注音输入法";
+"Please manually implement the symbols of this menu \nin the user phrase file with “_punctuation_list” key." = "请自行以「_punctuation_list」索引键\n在使用者自订语汇档案内扩充该符号选单的内容。";"Wildcard key cannot be the initial key." = "花牌键不得作为起始码。";
 "Wildcard key cannot be the initial key." = "花牌键不得作为起始码。";
 "CIN Cassette Mode" = "CIN 磁带模式";
 "Invalid Selection Keys." = "选字键参数资料值不规范。";
diff --git a/Source/Resources/zh-Hant.lproj/Localizable.strings b/Source/Resources/zh-Hant.lproj/Localizable.strings
index 30c90dea..3710c013 100644
--- a/Source/Resources/zh-Hant.lproj/Localizable.strings
+++ b/Source/Resources/zh-Hant.lproj/Localizable.strings
@@ -1,4 +1,5 @@
 "vChewing" = "威注音輸入法";
+"Please manually implement the symbols of this menu \nin the user phrase file with “_punctuation_list” key." = "請自行以「_punctuation_list」索引鍵\n在使用者自訂語彙檔案內擴充該符號選單的內容。";
 "Wildcard key cannot be the initial key." = "花牌鍵不得作為起始碼。";
 "CIN Cassette Mode" = "CIN 磁帶模式";
 "Invalid Selection Keys." = "選字鍵參數資料值不規範。";