fix: projection for non-usable

app/ecs-components/inventory.js

@@ -64,7 +64,7 @@ export default class Inventory extends Component {
         const layer = TileLayers.layer(0);
         const {projection} = this.json;
         if (!projection) {
-          return [];
+          return undefined;
         }
         let startX = position.x;
         let startY = position.y;