From 0bf8cbaf1e4df06695381d6a0516a1b5c6635b79 Mon Sep 17 00:00:00 2001
From: Jan-Piet Mens <jpmens@gmail.com>
Date: Wed, 24 Feb 2016 07:52:19 +0100
Subject: [PATCH] protect against missing tst in JSON

---
 listsort.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/listsort.c b/listsort.c
index 4bf3cf9..9fea5de 100644
--- a/listsort.c
+++ b/listsort.c
@@ -35,6 +35,11 @@ static double cmp(JsonNode * a, JsonNode * b)
 	JsonNode *tb = json_find_member(b, "tst");
 	//printf("a=%lf, b=%lf\n", ta->number_, tb->number_);
 
+	/* user may have chosen fields without tst */
+
+	if (!ta || !tb)
+		return (0.0);
+
 	return ta->number_ - tb->number_;
 }