Index: Slim/DataStores/DBI/DBIStore.pm
===================================================================
--- Slim/DataStores/DBI/DBIStore.pm	(revision 6543)
+++ Slim/DataStores/DBI/DBIStore.pm	(working copy)
@@ -1696,6 +1696,7 @@
 		# Bug 1143: The user has updated the genre tag, and is
 		# rescanning We need to remove the previous associations.
 		for my $genreObj ($track->genres) {
+			next unless ($genreObj ne "");
 			$genreObj->delete;
 		}