Every time I try to "Ignore Selected Artists" it results in 500 Internal Server Error

[hubdows]

Version:
b690850 (develop)

Browser Address:
http://ds1821:8181/addArtists?action=ignore&10+things+i+hate+about+you=on

500 Internal Server Error
The server encountered an unexpected condition which prevented it from fulfilling the request.

Traceback (most recent call last):
File "/volume1/@appstore/headphones/share/Headphones/lib/cherrypy/_cprequest.py", line 674, in respond
self._do_respond(path_info)
File "/volume1/@appstore/headphones/share/Headphones/lib/cherrypy/_cprequest.py", line 733, in _do_respond
response.body = self.handler()
^^^^^^^^^^^^^^
File "/volume1/@appstore/headphones/share/Headphones/lib/cherrypy/lib/encoding.py", line 236, in call
self.body = self.oldhandler(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/volume1/@appstore/headphones/share/Headphones/lib/cherrypy/_cpdispatch.py", line 58, in call
return self.callable(*self.args, **self.kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/volume1/@appstore/headphones/share/Headphones/headphones/webserve.py", line 430, in addArtists
[artist.decode(headphones.SYS_ENCODING, 'replace')])
^^^^^^^^^^^^^
AttributeError: 'str' object has no attribute 'decode'
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