gui: Set progressDialog to nullptr

Author: promag

src/qt/bitcoingui.cpp

@@ -1341,6 +1341,7 @@ void BitcoinGUI::showProgress(const QString &title, int nProgress)
         if (progressDialog) {
             progressDialog->close();
             progressDialog->deleteLater();
+            progressDialog = nullptr;
         }
     } else if (progressDialog) {
         progressDialog->setValue(nProgress);

src/qt/walletview.cpp

@@ -316,6 +316,7 @@ void WalletView::showProgress(const QString &title, int nProgress)
         if (progressDialog) {
             progressDialog->close();
             progressDialog->deleteLater();
+            progressDialog = nullptr;
         }
     } else if (progressDialog) {
         if (progressDialog->wasCanceled()) {