Bleachbit error while runnig as root

I'm getting following 2 errors in bleach bit lately

Recent documents list 0 
Error: system.memory: Function: Memory
Traceback (most recent call last):
  File "/usr/share/bleachbit/Worker.py", line 83, in execute
    for ret in cmd.execute(self.really_delete):
  File "/usr/share/bleachbit/Command.py", line 147, in execute
    for func_ret in self.func():
  File "/usr/share/bleachbit/Memory.py", line 302, in wipe_memory
    wipe_swap_linux(devices, proc_swaps)
  File "/usr/share/bleachbit/Memory.py", line 274, in wipe_swap_linux
    logger.info(_("Wiping the swap device %s."), device)
UnboundLocalError: local variable '_' referenced before assignment
Overwrite free disk space /root/.cache 0