Subject says it all:

[gerald@soliton gerald]$ hwbrowser
Traceback (most recent call last):
  File "/usr/share/hwbrowser/DeviceList.py", line 203, in ?
    reread_device_type_list ()
  File "/usr/share/hwbrowser/DeviceList.py", line 150, in reread_device_type_list
    list.set (iter, 0, hardware.get_category_string (key), 1, key)
  File "/usr/share/hwbrowser/DeviceList.py", line 91, in get_category_string
    return self.type_mapping[key]
KeyError: 20