TypeError: device_discovered() takes exactly 4 arguments

[kalvdans]

I started bluewho without arguments; a window flashed by and then this traceback occurred on the terminal.

$ bluewho
Gtk-Message: 15:36:56.620: Failed to load module "gail"
Gtk-Message: 15:36:56.621: Failed to load module "atk-bridge"
Traceback (most recent call last):
  File "/usr/bin/bluewho", line 444, in <module>
    on_toolbRefresh_clicked(None)
  File "/usr/bin/bluewho", line 285, in on_toolbRefresh_clicked
    executeScan()
  File "/usr/bin/bluewho", line 142, in executeScan
    devices.process_event()
  File "/usr/lib/python2.7/dist-packages/bluetooth/bluez.py", line 456, in process_event
    self._process_hci_event ()
  File "/usr/lib/python2.7/dist-packages/bluetooth/bluez.py", line 525, in _process_hci_event
    psrm, pspm, clockoff, rssi, name)
  File "/usr/lib/python2.7/dist-packages/bluetooth/bluez.py", line 588, in _device_discovered
    self.device_discovered (address, device_class, rssi, None)
TypeError: device_discovered() takes exactly 4 arguments (5 given)
$

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: bluewho 0.1-2
ProcVersionSignature: Ubuntu 5.13.0-1009.10-oem 5.13.0
Uname: Linux 5.13.0-1009-oem x86_64
NonfreeKernelModules: acpi_call zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Sat Oct 9 15:38:16 2021
EcryptfsInUse: Yes
PackageArchitecture: all
SourcePackage: bluewho
UpgradeStatus: Upgraded to focal on 2020-05-04 (523 days ago)