--- psinib.pl	2003/11/08 00:31:14	1.20
+++ psinib.pl	2003/11/08 01:46:53	1.21
@@ -100,7 +100,7 @@
 	}
 	$sub_nr++;
 	# skip comments in subjects.txt
-	while($subjects[$sub_nr] =~ m/^#/) {
+	while($subjects[$sub_nr] && $subjects[$sub_nr] =~ m/^#/) {
 		$sub_nr++;
 	}
 	$sub_nr = 0 if (! $subjects[$sub_nr]);