1 files changed, 1 insertions, 0 deletions

diff --git a/sway/input/seat.c b/sway/input/seat.c
index 4da8e937..b2243fe3 100644
--- a/sway/input/seat.c
+++ b/sway/input/seat.c
@@ -1095,6 +1095,7 @@ void seat_set_focus_layer(struct sway_seat *seat,
         } else if (!layer || seat->focused_layer == layer) {
                 return;
         }
+        assert(layer->mapped);
         seat_set_focus_surface(seat, layer->surface, true);
         if (layer->layer >= ZWLR_LAYER_SHELL_V1_LAYER_TOP) {
                 seat->focused_layer = layer;