From 55c77ac30754985c4d02138476cf053d2dd863fd Mon Sep 17 00:00:00 2001
From: Thomas White <taw@bitwiz.me.uk>
Date: Tue, 30 Apr 2019 17:52:03 +0200
Subject: Add an assertion

---
 libstorycode/stylesheet.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libstorycode/stylesheet.c b/libstorycode/stylesheet.c
index 77e37e1..4248f52 100644
--- a/libstorycode/stylesheet.c
+++ b/libstorycode/stylesheet.c
@@ -155,6 +155,7 @@ static struct style *lookup_style(struct style *sty, const char *path)
 	int i;
 	const char *nxt = path;
 
+	assert(sty != NULL);
 	if ( path[0] == '\0' ) return sty;
 
 	for ( i=0; i<sty->n_substyles; i++ ) {
-- 
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