1 files changed, 3 insertions, 0 deletions

diff --git a/sway/input/seatop_default.c b/sway/input/seatop_default.c
index 62261c77..0f4d0385 100644
--- a/sway/input/seatop_default.c
+++ b/sway/input/seatop_default.c
@@ -56,6 +56,9 @@ static bool edge_is_external(struct sway_container *cont, enum wlr_edges edge) {
         while (cont) {
                 if (container_parent_layout(cont) == layout) {
                         list_t *siblings = container_get_siblings(cont);
+                        if (!siblings) {
+                                return false;
+                        }
                         int index = list_find(siblings, cont);
                         if (index > 0 && (edge == WLR_EDGE_LEFT || edge == WLR_EDGE_TOP)) {
                                 return false;