Last.FM API Bug (now playing does not pull album urls at times)

lastFM-output_bug.xml

<?xml version="1.0" encoding="utf-8"?>
<lfm status="ok">
<recenttracks user="Alystair" page="1" perPage="2" totalPages="70928" total="141856" >
<track nowplaying="true"> 
            <artist mbid="158c6b17-a00a-4624-9ae0-d614d5dd0d52">Aphex Twin</artist>
<name>Ventolin [Carharrack Mix]</name>
<streamable>0</streamable>
<mbid></mbid>
    <album mbid=""></album>
<url>http://www.last.fm/music/Aphex+Twin/_/Ventolin+[Carharrack+Mix]</url>
    <image size="small"></image> 
    <image size="medium"></image>
    <image size="large"></image>
    <image size="extralarge"></image>
</track>
<track> 
                <artist mbid="158c6b17-a00a-4624-9ae0-d614d5dd0d52">Aphex Twin</artist>
<name>Ventolin [Carharrack Mix]</name>
<streamable>0</streamable>
<mbid></mbid>
        <album mbid="">Ventolin (The Remixes)</album>
    <url>http://www.last.fm/music/Aphex+Twin/_/Ventolin+[Carharrack+Mix]</url>
    <image size="small">http://userserve-ak.last.fm/serve/34s/29515517.jpg</image>
    <image size="medium">http://userserve-ak.last.fm/serve/64s/29515517.jpg</image>
    <image size="large">http://userserve-ak.last.fm/serve/126/29515517.jpg</image>
    <image size="extralarge">http://userserve-ak.last.fm/serve/300x300/29515517.jpg</image>
        <date uts="1338251688">29 May 2012, 00:34</date>
</track>
<track> 
                <artist mbid="158c6b17-a00a-4624-9ae0-d614d5dd0d52">Aphex Twin</artist>
<name>Ventolin [Carharrack Mix]</name>
<streamable>0</streamable>
<mbid></mbid>
        <album mbid="">Ventolin (The Remixes)</album>
    <url>http://www.last.fm/music/Aphex+Twin/_/Ventolin+[Carharrack+Mix]</url>
    <image size="small">http://userserve-ak.last.fm/serve/34s/29515517.jpg</image>
    <image size="medium">http://userserve-ak.last.fm/serve/64s/29515517.jpg</image>
    <image size="large">http://userserve-ak.last.fm/serve/126/29515517.jpg</image>
    <image size="extralarge">http://userserve-ak.last.fm/serve/300x300/29515517.jpg</image>
        <date uts="1338251390">29 May 2012, 00:29</date>
</track>
</recenttracks></lfm>