--- trunk/run.pl	2006/09/12 14:47:25	674
+++ trunk/run.pl	2006/09/13 17:32:49	675
@@ -402,7 +402,7 @@
 
 			# generate name of config key for indexer (strip everything after -)
 			my $indexer_config = $use_indexer;
-			$indexer_config =~ s/^(\w+)-?.*$/$1/g;
+			$indexer_config =~ s/^(\w+)-?.*$/$1/g if ($indexer_config);
 
 			foreach my $pos ( 0 ... $input_db->size ) {