diff --git a/js/enemy.mjs b/js/enemy.mjs
index 15468a8..61a8ce6 100644
--- a/js/enemy.mjs
+++ b/js/enemy.mjs
@@ -68,11 +68,15 @@ Event.listen("level/load/enemy", enemies => {
 		const {pos, size} = data;
 		const enemy = create(pos[0], pos[1], size[0], size[1]);
 
-		set_behaviour(enemy, data.behaviour);
+		if (data.hasOwnProperty("behaviour")) {
+			set_behaviour(enemy, data.behaviour);
+		}
 
 		const meta = Entity.get_meta(enemy);
-		for (const [key, value] of data.meta) {
-			meta.set(key, value);
+		if (data.hasOwnProperty("meta")) {
+			for (const [key, value] of data.meta) {
+				meta.set(key, value);
+			}
 		}
 
 		add(enemy);