diff --git a/src/electron/main.ts b/src/electron/main.ts
index 0f63e92..e439b8d 100644
--- a/src/electron/main.ts
+++ b/src/electron/main.ts
@@ -33,6 +33,10 @@ const launchTime = now();
 let preventQuit = false;
 let readyTime: number | null = null;
 
+let db: sqlite3.Database;
+let probeProcess: ChildProcess.ChildProcess;
+
+
 type OnDidLoadFn = (window: AppWindow) => void;
 /** See the `onDidLoad` function. */
 let onDidLoadFns: Array<OnDidLoadFn> | null = [];
@@ -186,7 +190,9 @@ app.on('ready', () => {
     path.join(__dirname, '..', '..', 'config', '_database.sqlite')
     : path.join(__dirname, '..', '..', 'bin', 'database.sqlite');
 
-  const db = new sqlite3.Database(dbPath, sqlite3.OPEN_READONLY, (err: Error) => {
+
+
+  db = new sqlite3.Database(dbPath, sqlite3.OPEN_READONLY, (err: Error) => {
     if (err) {
       console.error(err.message);
     }
@@ -195,7 +201,7 @@ app.on('ready', () => {
 
   if (!__DEV__) {
     const probePath = path.join(__dirname, '..', '..', 'bin', 'probe');
-    ChildProcess.spawn(probePath);
+    probeProcess = ChildProcess.spawn(probePath);
   }
 
   readyTime = now() - launchTime;
@@ -403,6 +409,19 @@ app.on('web-contents-created', (event, contents) => {
   });
 });
 
+app.on('before-quit', function (event) {
+  event.preventDefault();
+
+  if (null !== db) {
+    db.close();
+  }
+
+  if (null !== probeProcess && !probeProcess.killed) {
+    probeProcess.kill();
+  }
+
+});
+
 // app.on(
 //   'certificate-error',
 //   (event, webContents, url, error, certificate, callback) => {