From 5dd535b67a985c7751d1dc351528f0194c33458a Mon Sep 17 00:00:00 2001
From: Ryan Dwyer <ryandwyer1@gmail.com>
Date: Wed, 3 Oct 2018 22:09:20 +1000
Subject: [PATCH] Add sanity check for empty focus stack

---
 sway/input/seat.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sway/input/seat.c b/sway/input/seat.c
index e10b6409..69bee47e 100644
--- a/sway/input/seat.c
+++ b/sway/input/seat.c
@@ -952,6 +952,9 @@ struct sway_node *seat_get_focus(struct sway_seat *seat) {
 	if (!seat->has_focus) {
 		return NULL;
 	}
+	if (wl_list_length(&seat->focus_stack) == 0) {
+		return NULL;
+	}
 	struct sway_seat_node *current =
 		wl_container_of(seat->focus_stack.next, current, link);
 	return current->node;