From 95bd63e7b0fd13f20642795dd4f15ff3556ec8f3 Mon Sep 17 00:00:00 2001
From: Christian Neukirchen <chneukirchen@gmail.com>
Date: Sat, 23 Jul 2016 01:43:47 +0200
Subject: [PATCH] mthr: don't try to print a parent for toplevel messages

---
 contrib/mthr | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/contrib/mthr b/contrib/mthr
index 8dd01d6..2c4038c 100755
--- a/contrib/mthr
+++ b/contrib/mthr
@@ -33,8 +33,9 @@ mode==2 && ind <= dep { sel = 0 }
 }
 mode==2 && sel { print }
 mode==3 && sel {
-	print parents[ind-1]
-                 sel = 0
+	if (ind>0)
+		print parents[ind-1]
+	sel = 0
 }
 mode==3 {parents[ind] = $0 }
 ' - $(mseq $@)