Traceback (most recent call last):
  File "electrum/gui/qt/util.py", line 1443, in on_qt_callback_signal
  File "electrum/gui/qt/network_dialog.py", line 640, in on_event_network_updated
  File "electrum/gui/qt/network_dialog.py", line 212, in update
RuntimeError: wrapped C/C++ object of type NodesListWidget has been deleted