From dc48ebec7e316826f641d93e25ca90eb1929295a Mon Sep 17 00:00:00 2001
From: Ingo Schwarze <schwarze@openbsd.org>
Date: Thu, 4 Oct 2018 13:23:04 +0000
Subject: When a subsection header contains no letters but only special
 characters, skip the TOC entry.  Issue reported by kristaps@.

---
 mdoc_html.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mdoc_html.c b/mdoc_html.c
index d9976f12..073aee35 100644
--- a/mdoc_html.c
+++ b/mdoc_html.c
@@ -541,11 +541,13 @@ mdoc_sh_pre(MDOC_ARGS)
 			    subn = subn->next) {
 				if (subn->tok != MDOC_Ss)
 					continue;
+				id = html_make_id(subn->head, 0);
+				if (id == NULL)
+					continue;
 				if (tsub == NULL)
 					print_otag(h, TAG_UL,
 					    "c", "Bl-compact");
 				tsub = print_otag(h, TAG_LI, "");
-				id = html_make_id(subn->head, 0);
 				print_otag(h, TAG_A, "hR", id);
 				free(id);
 				print_mdoc_nodelist(meta,
-- 
cgit