Add sanity check for empty focus stack

1 files changed, 3 insertions, 0 deletions

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;