Pattern along Path: Error with 'single: stretched' option

Settings screenshot:

Error:

Traceback (most recent call last):
  File "pathalongpath.py", line 276, in <module>
    PathAlongPath().run()
  File "/opt/inkscape_master/share/inkscape/extensions/inkex/base.py", line 111, in run
    self.save_raw(self.effect())
  File "pathalongpath.py", line 223, in effect
    node.path = self._sekl_call(node.path.to_superpath(), dx, bbox)
  File "pathalongpath.py", line 260, in _sekl_call
    if not width:
UnboundLocalError: local variable 'width' referenced before assignment

Error does not happen with any of the other options.