diff --git a/lib/models/music_brainz.rb b/lib/models/music_brainz.rb
index 1bb44d8..fb9c325 100644
--- a/lib/models/music_brainz.rb
+++ b/lib/models/music_brainz.rb
@@ -2,7 +2,7 @@ module MusicBrainz
   @@last_query_time = 0
   @@query_interval = 1.5 # Min: 1.0 Safe: 1.5
   
-  def self.query_interval sec
+  def self.query_interval= sec
     @@query_interval = sec.to_f
   end
 
@@ -14,7 +14,7 @@ module MusicBrainz
         response = open(url, "User-Agent" => "gem musicbrainz (https://github.com/magnolia-fan/musicbrainz) @ " + Socket.gethostname)
         @@last_query_time = Time.now.to_f
       rescue => e
-        # MusicBrainz: 503
+        return nil if e.io.status[0].to_i == 404
       end
       break unless response.nil?
     end
diff --git a/lib/models/music_brainz/artist.rb b/lib/models/music_brainz/artist.rb
index 18a33b8..a362169 100644
--- a/lib/models/music_brainz/artist.rb
+++ b/lib/models/music_brainz/artist.rb
@@ -16,13 +16,15 @@ module MusicBrainz
     end
   
     def self.find mbid
-      @artist = self.parse_xml(Nokogiri::XML(MusicBrainz.load('http://musicbrainz.org/ws/2/artist/' + mbid)))
+      res = MusicBrainz.load('http://musicbrainz.org/ws/2/artist/' + mbid)
+      return nil if res.nil?
+      @artist = self.parse_xml(Nokogiri::XML(res))
     end
   
     def self.parse_xml xml
       @artist = MusicBrainz::Artist.new
       @artist.id = xml.css('artist').attr('id').value
-      @artist.type = xml.css('artist').attr('type').value
+      @artist.type = xml.css('artist').attr('type').value unless xml.css('artist').nil? or xml.css('artist').attr('type').nil?
       @artist.name = xml.css('artist > name').text
       @artist.country = xml.css('artist > country').text unless xml.css('artist > country').empty?
       @artist.date_begin = xml.css('artist > life-span > begin').text unless xml.css('artist > life-span > begin').empty?
diff --git a/musicbrainz.gemspec b/musicbrainz.gemspec
index d81b078..62ef5ba 100644
--- a/musicbrainz.gemspec
+++ b/musicbrainz.gemspec
@@ -5,11 +5,11 @@
 
 Gem::Specification.new do |s|
   s.name = %q{musicbrainz}
-  s.version = "0.4.3"
+  s.version = "0.4.7"
 
   s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=
   s.authors = ["Gregory Eremin"]
-  s.date = %q{2011-09-14}
+  s.date = %q{2011-09-19}
   s.description = %q{MusicBrainz Web Service wrapper with ActiveRecord-style models}
   s.email = %q{magnolia_fan@me.com}
   s.extra_rdoc_files = [