From e4856de8bf23108ee9d335a22d7e16dd8ad855d8 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Mon, 20 Dec 2021 09:02:12 +0000
Subject: [PATCH] Do not crash on a zero size character.

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

diff --git a/window-copy.c b/window-copy.c
index ec6a2f4e..9a0179a4 100644
--- a/window-copy.c
+++ b/window-copy.c
@@ -3148,6 +3148,11 @@ window_copy_cellstring(const struct grid_line *gl, u_int px, size_t *size,
 	}
 
 	utf8_to_data(gl->extddata[gce->offset].data, &ud);
+	if (ud.size == 0) {
+		*size = 0;
+		*allocated = 0;
+		return (NULL);
+	}
 	*size = ud.size;
 	*allocated = 1;