fix

src/main/index.ts

@@ -9,6 +9,12 @@ import process from "process";
 const isDev = process.env.NODE_ENV === "development";
 let win: BrowserWindow | null = null;
 let loadWin: any = null;
+const additionalData = { lockKey: "scanAdmin" };
+const gotTheLock = app.requestSingleInstanceLock(additionalData);
+console.log("gotTheLock", gotTheLock);
+if (!gotTheLock) {
+  app.quit();
+}
 
 function createWin() {
   const { width, height } = screen.getPrimaryDisplay().bounds;