From a6b361e775e0bf6301284391e75dd9af7af340da Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Mon, 17 Jan 2022 10:40:03 +0000
Subject: [PATCH] Do not try to strdup NULL, from seL4 at disroot dot org in
 GitHub issue 3038.

---
 popup.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/popup.c b/popup.c
index ed6a6bb9..bebc7cc6 100644
--- a/popup.c
+++ b/popup.c
@@ -668,7 +668,8 @@ popup_display(int flags, enum box_lines lines, struct cmdq_item *item, u_int px,
 	pd = xcalloc(1, sizeof *pd);
 	pd->item = item;
 	pd->flags = flags;
-	pd->title = xstrdup(title);
+	if (title != NULL)
+		pd->title = xstrdup(title);
 
 	pd->c = c;
 	pd->c->references++;