Crashes while trying to print exception

[Afiefh]

While creating a bootlable usb, got the following exception:

Traceback (most recent call last):
  File "/usr/lib/python3.3/logging/handlers.py", line 72, in emit
    if self.shouldRollover(record):
  File "/usr/lib/python3.3/logging/handlers.py", line 187, in shouldRollover
    msg = "%s\n" % self.format(record)
  File "/usr/lib/python3.3/logging/__init__.py", line 808, in format
    return fmt.format(record)
  File "/usr/lib/python3.3/logging/__init__.py", line 554, in format
    record.exc_text = self.formatException(record.exc_info)
  File "/usr/lib/python3.3/logging/__init__.py", line 504, in formatException
    traceback.print_exception(ei[0], ei[1], tb, None, sio)
  File "/usr/lib/python3.3/traceback.py", line 156, in print_exception
    for value, tb in values:
  File "/usr/lib/python3.3/traceback.py", line 122, in _iter_chain
    context = exc.__context__