fix #4159

gui/qt/main_window.py

@@ -396,7 +396,11 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
             self.show_warning(msg, title=_('Information'))
 
     def open_wallet(self):
-        wallet_folder = self.get_wallet_folder()
+        try:
+            wallet_folder = self.get_wallet_folder()
+        except FileNotFoundError as e:
+            self.show_error(str(e))
+            return
         filename, __ = QFileDialog.getOpenFileName(self, "Select your wallet file", wallet_folder)
         if not filename:
             return
@@ -440,7 +444,11 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         return os.path.dirname(os.path.abspath(self.config.get_wallet_path()))
 
     def new_wallet(self):
-        wallet_folder = self.get_wallet_folder()
+        try:
+            wallet_folder = self.get_wallet_folder()
+        except FileNotFoundError as e:
+            self.show_error(str(e))
+            return
         i = 1
         while True:
             filename = "wallet_%d" % i

lib/simple_config.py

@@ -233,6 +233,10 @@ class SimpleConfig(PrintError):
             return path
 
         # default path
+        if not os.path.exists(self.path):
+            raise FileNotFoundError(
+                _('Electrum datadir does not exist. Was it deleted while running?') + '\n' +
+                _('Should be at {}').format(self.path))
         dirpath = os.path.join(self.path, "wallets")
         if not os.path.exists(dirpath):
             if os.path.islink(dirpath):