fix #6605

electrum/gui/qt/installwizard.py

@@ -248,6 +248,7 @@ class InstallWizard(QDialog, MessageBoxMixin, BaseWizard):
             nonlocal temp_storage
             temp_storage = None
             msg = None
+            if filename:
                 path = os.path.join(wallet_folder, filename)
                 wallet_from_memory = get_wallet_from_daemon(path)
                 try:
@@ -260,6 +261,8 @@ class InstallWizard(QDialog, MessageBoxMixin, BaseWizard):
                 except Exception as e:
                     self.logger.exception('')
                     msg = _('Cannot read file') + f'\n{repr(e)}'
+            else:
+                msg = _('')
             self.next_button.setEnabled(temp_storage is not None)
             user_needs_to_enter_password = False
             if temp_storage: