Description of problem:
running the program caused it

Version-Release number of selected component:
bleachbit-1.12-2.fc26

Additional info:
reporter:       libreport-2.9.1
cmdline:        /usr/bin/python2 /usr/bin/bleachbit -c chrome.cache
crash_function: run_operations
exception_type: KeyError
executable:     /usr/bin/bleachbit
kernel:         4.12.9-300.fc26.x86_64
runlevel:       N 5
type:           Python
uid:            0

Truncated backtrace:
Worker.py:326:run_operations:KeyError: 'chrome'

Traceback (most recent call last):
  File "/usr/bin/bleachbit", line 51, in <module>
    bleachbit.CLI.process_cmd_line()
  File "/usr/share/bleachbit/CLI.py", line 204, in process_cmd_line
    preview_or_clean(operations, True)
  File "/usr/share/bleachbit/CLI.py", line 88, in preview_or_clean
    while worker.next():
  File "/usr/share/bleachbit/Worker.py", line 245, in run
    for dummy in self.run_operations(self.operations):
  File "/usr/share/bleachbit/Worker.py", line 326, in run_operations
    name = backends[operation].get_name()
KeyError: 'chrome'

Local variables in innermost frame:
count: 0
operation: 'chrome'
my_operations: {'chrome': ['cache']}
self: <bleachbit.Worker.Worker instance at 0x7fd2d547d488>