commit - 7067473a26a54b54c145c4faa2507415faa07e0b
commit + f3e4455dd7582662a33fc6fe79a1fbaacfb739ab
blob - ee0199436c9815353374f0f348ee48945b275087
blob + cbfc692f602abdaa0d18953060ed2ade7554b340
--- mexp
+++ mexp
@@ -81,6 +81,7 @@ while (<>) {
 	$level = 10 if $indent =~ m/\.\.\d{2}\.\./;
 
 	$tid = $mid if $level == 0;
+	die "unknown tid" unless defined $tid;
 
 	genmbox($fname, $mid);