From 33f71eb118c81e788cd64049d70c8f79e969f2ac Mon Sep 17 00:00:00 2001
From: Sergey Poznyakoff <gray@gnu.org>
Date: Sun, 25 Aug 2019 05:27:47 +0000
Subject: Bugfix

* lib/utf8.c (utf8_iter0): Switch to error state if utf8_char_width
returned 0
---
diff --git a/lib/utf8.c b/lib/utf8.c
index a25c613..3653d59 100644
--- a/lib/utf8.c
+++ b/lib/utf8.c
@@ -1545,7 +1545,7 @@ utf8_iter0(struct utf8_iterator *itr)
 	return 1;
     }
     n = utf8_char_width(itr->curptr);
-    if (n > itr->length) {
+    if (n == 0 || n > itr->length) {
 	itr->end = 1;
 	itr->err = 1;
 	return 1;
--
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