initialize the variable

I get an error

:Simplenote -l

Traceback (most recent call last):
  File "<string>", line 12, in <module>
  File "<string>", line 440, in list_note_index_in_scratch_buffer
  File "<string>", line 212, in format_title
  File "<string>", line 96, in format_title_len_no_conceal
UnboundLocalError: local variable 'length' referenced before assignment

Probably it is an error to happen because length of simplenote.vim #242 is not initialized.
It was recovered when I initialized a variable with 0.

I beg your kindness.