Random error after saving a .ts file

[pocesar]

Exception in thread Thread-19:
Traceback (most recent call last):
  File "X/threading.py", line 639, in _bootstrap_inner
  File "G:\Dropbox\ST3\Data\Packages\T3S\Typescript.py", line 429, in run
    self.result = Popen([cmd, self.filename], stdin=PIPE, stdout=PIPE, **kwargs)
  File "X/subprocess.py", line 818, in __init__
  File "X/subprocess.py", line 1049, in _execute_child
  File "X/subprocess.py", line 627, in list2cmdline
TypeError: argument of type 'NoneType' is not iterable