local variable 'url' referenced before assignment

[bootsmann]

Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/bottle.py", line 744, in _handle
return route.call(*_args)
File "/usr/local/lib/python2.7/dist-packages/bottle.py", line 1528, in wrapper
self.trigger('before_request')
File "/usr/local/lib/python2.7/dist-packages/bottle.py", line 1523, in trigger
return [hook(_a, **ka) for hook in hooks]
File "/usr/local/lib/python2.7/dist-packages/bottle_sslify.py", line 27, in https_redirect
redirect(url, code=code)
UnboundLocalError: local variable 'url' referenced before assignment