diff --git a/examples/spark/package-lock.json b/examples/spark/package-lock.json
index cab0a93..b919e58 100644
--- a/examples/spark/package-lock.json
+++ b/examples/spark/package-lock.json
@@ -4118,9 +4118,9 @@
       }
     },
     "physar": {
-      "version": "0.1.2",
-      "resolved": "https://registry.npmjs.org/physar/-/physar-0.1.2.tgz",
-      "integrity": "sha512-xTAkiUourfIN0EM/XmABJVHmTxezbDeZNlMxKbYzGp/eJ2H+TLOTOFDpvPro/wB7kLinPiONy+R/+RU/8VMHTw=="
+      "version": "0.1.9-0",
+      "resolved": "https://registry.npmjs.org/physar/-/physar-0.1.9-0.tgz",
+      "integrity": "sha512-hTLsN6Gpa17AebioHsfaPuduAhnA62W0idOtUYJfNL1jcFT9Lvptwo20Ra4W/ZHpyiqP+5EIRt9r8OMQF7YpVA=="
     },
     "pify": {
       "version": "4.0.1",
diff --git a/examples/spark/package.json b/examples/spark/package.json
index df19801..19029ec 100644
--- a/examples/spark/package.json
+++ b/examples/spark/package.json
@@ -10,7 +10,7 @@
     "start": "npm run dev"
   },
   "dependencies": {
-    "physar": "^0.1.2",
+    "physar": "^0.1.9-0",
     "short-uuid": "^3.1.1",
     "webpack": "^4.41.6"
   },
diff --git a/examples/spark/src/index.js b/examples/spark/src/index.js
index 7bb3562..cf7fd93 100644
--- a/examples/spark/src/index.js
+++ b/examples/spark/src/index.js
@@ -59,6 +59,8 @@ const groundProps = {
   }
 }
 physar.createObject(plane, 'ground', groundProps)
-physar.createObject(sphere, 'sphere', sphereProps)
-physar.createObject(cube, 'box', cubeProps)
+const sphereID = physar.createObject(sphere, 'sphere', sphereProps)
+const boxID = physar.createObject(cube, 'box', cubeProps)
+
+const constraint = physar.addConstrait(sphereID, boxID)
 physar.start()
diff --git a/src/index.js b/src/index.js
index ab3f740..7a240f0 100644
--- a/src/index.js
+++ b/src/index.js
@@ -322,7 +322,7 @@ export default class Physar {
     // We need at least two bodies to make a constraint.
     if ( !params.bodyA || !params.bodyB) return
     
-    let { bodyA, bodyB, pivotA, pivotB, axisA, axisB } = params
+    let [bodyA, bodyB, pivotA, pivotB, axisA, axisB] = params
     const options = {
       pivotA,
       pivotB,
@@ -404,12 +404,12 @@ export default class Physar {
 
   resumeConstraint(id) {
     const c = this.find('constraint', id)
-    const {id, constraint} = c
+    const [id, constraint] = c
 
     if(c && c.isActive == false) {
 
       this.world.addConstraint(constraint)
-      
+
       const idx = this.worldConstraints.indexOf(c)
       this.worldConstraints[idx].isActive = true
     }