diff --git a/Source/Modules/ControllerModules/KeyHandler_HandleInput.swift b/Source/Modules/ControllerModules/KeyHandler_HandleInput.swift
index 519b6e58..78e9ee4e 100644
--- a/Source/Modules/ControllerModules/KeyHandler_HandleInput.swift
+++ b/Source/Modules/ControllerModules/KeyHandler_HandleInput.swift
@@ -48,6 +48,12 @@ extension KeyHandler {
 
     // 提前過濾掉一些不合規的按鍵訊號輸入，免得相關按鍵訊號被送給 Megrez 引發輸入法崩潰。
     if input.isInvalidInput {
+      // 在「.Empty(IgnoringPreviousState) 與 .Deactivated」狀態下的首次不合規按鍵輸入可以直接放行。
+      if state is InputState.Empty || state is InputState.Deactivated
+        || state is InputState.EmptyIgnoringPreviousState
+      {
+        return false
+      }
       IME.prtDebugIntel("550BCF7B: KeyHandler just refused an invalid input.")
       errorCallback()
       stateCallback(state)