Properly close app on welcome back cancel

src/mainwindow.cpp

@@ -388,11 +388,14 @@ void MainWindow::closeEvent(QCloseEvent* event) {
     s.sync();
 
     // Let the RPC know to shut down any running service.
+    if(rpc){
         rpc->shutdownhushd();
-    int passphraselenght = DataStore::getChatDataStore()->getPassword().length();
+    }
+
+    int passphraselength = DataStore::getChatDataStore()->getPassword().length();
 
     // Check is encryption is ON for SDl
-    if(passphraselenght > 0) {
+    if(passphraselength > 0) {
         // delete old file before
 
         //auto dirHome =  QDir(QStandardPaths::writableLocation(QStandardPaths::HomeLocation));
@@ -635,6 +638,10 @@ void MainWindow::removeWalletEncryptionStartUp() {
     Ui_startup ed;
     ed.setupUi(&d);
 
+    // Connect cancel button to close app on queued connection
+    QObject::connect(ed.buttonBox, &QDialogButtonBox::rejected, qApp, &QCoreApplication::quit, Qt::QueuedConnection);
+
+    // Connect new/restore button click
     QObject::connect(ed.new_restore, &QPushButton::clicked, [&] {
 
         d.close();
@@ -648,8 +655,7 @@ void MainWindow::removeWalletEncryptionStartUp() {
         cl->loadConnection();
     });
 
-    if (d.exec() == QDialog::Accepted) 
-    {
+    if (d.exec() == QDialog::Accepted){
         QString passphraseBlank = ed.txtPassword->text(); // data comes from user inputs
 
         QString passphrase = QString("HUSH3") + passphraseBlank + QString("SDL");
@@ -708,7 +714,6 @@ void MainWindow::removeWalletEncryptionStartUp() {
     }else{
         this->doClosePw();
     }
-
 }
 
 QString MainWindow::getPassword()