File "/tmp/.mount_electrSe9omh/usr/lib/python3.7/site-packages/electrum/gui/qt/channel_details.py", line 116, in do_ln_payment_failed
    self.move('inflight', 'failed', payment_hash)
  File "/tmp/.mount_electrSe9omh/usr/lib/python3.7/site-packages/electrum/gui/qt/channel_details.py", line 79, in move
    row_idx = self.keyname_rows[fro].pop(payment_hash)