diff --git a/sway/input/seat.c b/sway/input/seat.c
index 0434d637c..1f108623d 100644
--- a/sway/input/seat.c
+++ b/sway/input/seat.c
@@ -1312,6 +1312,9 @@ void seat_set_focus_layer(struct sway_seat *seat,
 	} else if (!layer) {
 		return;
 	}
+	if (server.session_lock.lock) {
+		return;
+	}
 	assert(layer->surface->mapped);
 	if (layer->current.layer >= ZWLR_LAYER_SHELL_V1_LAYER_TOP &&
 			layer->current.keyboard_interactive