[LayaAir 2.0]用cannon测试 在U3D 中加MeshCollider后运行报 _addPhysicsCollider错误，取消后，则不会

ncaught TypeError: Cannot read property '_addPhysicsCollider' of undefined
    at PhysicsCollider._addToSimulation (laya.d3.js:28717)
    at PhysicsCollider._onEnable (laya.d3.js:2896)
    at PhysicsCollider._setActive (laya.core.js:20312)
    at MeshSprite3D._activeHierarchy (laya.core.js:13195)
    at Sprite3D._activeHierarchy (laya.core.js:13201)
    at Scene3D._activeHierarchy (laya.core.js:13201)
    at Scene3D._processActive (laya.core.js:13184)
    at Scene3D._onAdded (laya.core.js:13255)
    at Scene3D._setParent (laya.core.js:13013)
    at Scene3D._setParent (laya.core.js:14207)