Traceback (most recent call last):
  File "app/electrum/gui/common_qt/util.py", line 214, in on_qt_callback_signal
  File "app/electrum/gui/qml/qetransactionlistmodel.py", line 54, in on_event_verified
  File "app/electrum/gui/qml/qetransactionlistmodel.py", line 239, in on_tx_verified
  File "app/electrum/gui/qml/qetransactionlistmodel.py", line 168, in get_section_by_timestamp
TypeError: 'NoneType' object cannot be interpreted as an integer