фикс краша при отключении vpn (vibe-kanban 4dcd8b1b)

У нас реализовано подключение к vpn и оно отлично работает. Но при нажатии на кнопку отключить происходит краш:
PS C:\\Users\\hamy\\HamyDev\\HamyVPNClient\\HamyVPNClient> go run .

2026/01/16 20:01:32 Sing-box configuration written to config.json

Exception 0xc0000005 0x1 0x1 0x7ffbb351b5d5

PC=0x7ffbb351b5d5

signal arrived during external code execution

configs.json

@@ -0,0 +1,6 @@
+[
+  {
+    "Title": "Конфиг 1",
+    "URL": "vless://3da694cb-cca3-4849-81c3-9ff60c4dc399@193.124.93.179:39590?type=tcp\u0026encryption=none\u0026security=none#TCP%20HamyVPN-TEST2"
+  }
+]

main.go

@@ -174,7 +174,10 @@ func runSingBox(configPath string) error {
 	if currentProcess != nil && currentProcess.Process != nil {
 		// Attempt to terminate gracefully first
 		currentProcess.Process.Kill()
-		currentProcess.Wait() // Wait for graceful termination
+		// Wait for the process to finish in a separate goroutine to avoid blocking
+		go func(p *exec.Cmd) {
+			p.Wait() // Wait for graceful termination
+		}(currentProcess)
 		currentProcess = nil
 	}
 
@@ -213,6 +216,7 @@ func isProcessRunning(cmd *exec.Cmd) bool {
     }
 
     // On Windows, check if the process is still alive by getting its state
+    // Using syscall.Signal(0) just checks if we can send a signal (process exists)
     err := cmd.Process.Signal(syscall.Signal(0))
     return err == nil
 }
@@ -220,17 +224,27 @@ func isProcessRunning(cmd *exec.Cmd) bool {
 // killCurrentProcess terminates the current sing-box process if running
 func killCurrentProcess() {
 	processMutex.Lock()
-	defer processMutex.Unlock()
 
-	if currentProcess != nil && currentProcess.Process != nil {
+	// Create a local copy of the current process to avoid race conditions
+	cmd := currentProcess
+	currentProcess = nil
+
+	processMutex.Unlock()
+
+	if cmd != nil && cmd.Process != nil {
 		// Check if the process is still running before attempting to kill it
-		if isProcessRunning(currentProcess) {
+		if isProcessRunning(cmd) {
 			// Use TerminateProcess syscall for more reliable termination on Windows
-			currentProcess.Process.Kill()
-			// Wait for the process to actually terminate
-			currentProcess.Wait()
+			err := cmd.Process.Kill()
+			if err != nil {
+				log.Printf("Error killing process: %v", err)
+			}
+
+			// Wait for the process to actually terminate in a separate goroutine to avoid blocking
+			go func(p *exec.Cmd) {
+				p.Wait() // Wait for the process to finish
+			}(cmd)
 		}
-		currentProcess = nil
 	}
 }
 
@@ -562,24 +576,34 @@ func disableSystemProxy() error {
 func notifyProxyChange() {
 	// Use Windows API to notify about proxy change
 	// Call InternetSetOption to refresh proxy settings
-	procInternetSetOption := syscall.NewLazyDLL("wininet.dll").NewProc("InternetSetOptionW")
-	procInternetSetOption.Call(
-		0,                // hInternet = NULL
-		39,               // INTERNET_OPTION_SETTINGS_CHANGED
-		0,                // lpBuffer = NULL
-		0,                // dwBufferLength = 0
-	)
+	wininetDLL := syscall.NewLazyDLL("wininet.dll")
+	if wininetDLL != nil {
+		procInternetSetOption := wininetDLL.NewProc("InternetSetOptionW")
+		if procInternetSetOption != nil {
+			procInternetSetOption.Call(
+				0,                // hInternet = NULL
+				39,               // INTERNET_OPTION_SETTINGS_CHANGED
+				0,                // lpBuffer = NULL
+				0,                // dwBufferLength = 0
+			)
+		}
+	}
 
 	// Also send WM_SETTINGCHANGE to broadcast the change
-	procSendMessageTimeout := syscall.NewLazyDLL("user32.dll").NewProc("SendMessageTimeoutW")
-	procSendMessageTimeout.Call(
-		0xFFFF,           // HWND_BROADCAST
-		0x001A,           // WM_SETTINGCHANGE
-		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr("Proxy"))),
-		0,
-		0x0002,           // SMTO_ABORTIFHUNG
-		5000,             // timeout
-	)
+	user32DLL := syscall.NewLazyDLL("user32.dll")
+	if user32DLL != nil {
+		procSendMessageTimeout := user32DLL.NewProc("SendMessageTimeoutW")
+		if procSendMessageTimeout != nil {
+			procSendMessageTimeout.Call(
+				0xFFFF,           // HWND_BROADCAST
+				0x001A,           // WM_SETTINGCHANGE
+				uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr("Proxy"))),
+				0,
+				0x0002,           // SMTO_ABORTIFHUNG
+				5000,             // timeout
+			)
+		}
+	}
 }
 
 func main() {