diff --git a/poller.pl b/poller.pl
index a6e30cd..9fe907d 100644
--- a/poller.pl
+++ b/poller.pl
@@ -153,9 +153,30 @@ sub validate {
   my @warnings;
   if ($type eq 'artist') {
     # make sure there are albums
-    unless (exists $json->{albums} and scalar @{$json->{albums}}) {
+    unless (exists $json->{Albums} and scalar @{$json->{Albums}}) {
       push(@warnings, 'no albums');
     }
   }
-  return @warnings;
+  else {
+    # detect Unknown Artist problem
+    unless (exists $json->{artists} and scalar @{$json->{artists}} and
+	    exists $json->{artists}[0]{artistname} and
+	    $json->{artists}[0]{artistname} !~ m%^Unknown Artist \(%) {
+      push(@warnings, 'no artist');
+    }
+    unless (exists $json->{Releases} and scalar @{$json->{Releases}}) {
+      push(@warnings, 'no releases');
+    }
+    else {
+      unless (exists $json->{Releases}[0]{Tracks} and
+	      scalar @{$json->{Releases}[0]{Tracks}}) {
+	push(@warnings, 'no tracks');
+      }
+    }
+  }
+  if (@warnings) {
+    warn 'WARNING: ' . join(', ', @warnings) . "\n";
+    return 0;
+  }
+  return 1;
 }
\ No newline at end of file