File "/usr/lib/python3.9/site-packages/electrum/gui/qt/rbf_dialog.py", line 56, in on_feerate
    fee_rate = self.feerate_e.get_amount()
  File "/usr/lib/python3.9/site-packages/electrum/gui/qt/amountedit.py", line 128, in get_amount
    return quantize_feerate(sat_per_byte_amount)
  File "/usr/lib/python3.9/site-packages/electrum/util.py", line 694, in quantize_feerate
    return Decimal(fee).quantize(_feerate_quanta, rounding=decimal.ROUND_HALF_DOWN)
  File "/usr/lib/python3.9/_pydecimal.py", line 2573, in quantize
    return context._raise_error(InvalidOperation,
  File "/usr/lib/python3.9/_pydecimal.py", line 4044, in _raise_error
    raise error(explanation)