From c63debe296ec40bda08a8083bd667aec7a549f32 Mon Sep 17 00:00:00 2001
From: Jack251970 <1160210343@qq.com>
Date: Sun, 23 Mar 2025 20:57:25 +0800
Subject: [PATCH] Add foreground window check

---
 Flow.Launcher.Infrastructure/Win32Helper.cs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/Flow.Launcher.Infrastructure/Win32Helper.cs b/Flow.Launcher.Infrastructure/Win32Helper.cs
index 108f51fd4..226d7b76c 100644
--- a/Flow.Launcher.Infrastructure/Win32Helper.cs
+++ b/Flow.Launcher.Infrastructure/Win32Helper.cs
@@ -386,8 +386,12 @@ namespace Flow.Launcher.Infrastructure
             // No installed English layout found
             if (enHKL == HKL.Null) return;
 
-            // Get the current window thread ID
-            var threadId = PInvoke.GetWindowThreadProcessId(PInvoke.GetForegroundWindow());
+            // Get the current foreground window
+            var hwnd = PInvoke.GetForegroundWindow();
+            if (hwnd == HWND.Null) return;
+
+            // Get the current foreground window thread ID
+            var threadId = PInvoke.GetWindowThreadProcessId(hwnd);
             if (threadId == 0) throw new Win32Exception(Marshal.GetLastWin32Error());
 
             // If the current layout has an IME mode, disable it without switching to another layout.