UnicodeDecodeError lastfm plugin

[aledj@…]

A window popped up saying:

This is a bug. Please report it at: http://www.emesene.org

Traceback (most recent call last):

File "/home/v0n0/dev/emesene/plugins_base/lastfm.py", line 241, in on_currentmediaChange

if self.lastfm.post(element[0],element[1],element[2],element[3],element[4]):

File "/home/v0n0/dev/emesene/plugins_base/lastfm.py", line 154, in post

track = {'a[%s]': artist_name.decode(self.enc).encode('utf8'),

UnicodeDecodeError?: 'ascii' codec can't decode byte 0xc3 in position 3: ordinal not in range(128)

[aledj@…]

The error pops up when amarok changes song and I visualize song in my personal message. Using Debian testing and Emesene svn.