diff --git a/7p8dxknb7m.js b/7p8dxknb7m.js
index bb849bd..5fbc351 100644
--- a/7p8dxknb7m.js
+++ b/7p8dxknb7m.js
@@ -219,26 +219,25 @@ if (GameLib.Utils.UndefinedOrNull(this.initialized)) {
 	
 	this.burnTree = function(mesh) {
 		
-		if (mesh.userData.burning) {
+		if (mesh.burning) {
 			/**
 			 * Do nothing, this tree is burning
 			 */
 		} else {
-			mesh.userData.burning = true;
+			mesh.burning = true;
 			
 			var smokeParticleEngine = this.smokeParticleEngine.clone();
 			smokeParticleEngine.position = mesh.position.clone();
 			smokeParticleEngine.updateInstance('position');
 			smokeParticleEngine.enabled = true;
 			
-			mesh.userData.smokeParticleEngine = smokeParticleEngine;
+			mesh.smokeParticleEngine = smokeParticleEngine;
 		
 			var fireParticleEngine = this.fireParticleEngine.clone();
 			fireParticleEngine.position = mesh.position.clone();
 			fireParticleEngine.updateInstance('position');
 			fireParticleEngine.enabled = true;
-			mesh.userData.fireParticleEngine = fireParticleEngine;
-			
+			mesh.fireParticleEngine = fireParticleEngine;
 		}        
     }
 }