[LayaAir 2.0]laya.physics.js:430 Cannot read property 'GetType' of null
Uncaught TypeError: Cannot read property 'GetType' of null
at box2d.b2Fixture.GetType (laya.physics.js:430)
at box2d.b2ContactFactory.Create (laya.physics.js:576)
at box2d.b2ContactManager.AddPair (laya.physics.js:586)
at box2d.b2BroadPhase.UpdatePairs (laya.physics.js:308)
at box2d.b2ContactManager.FindNewContacts (laya.physics.js:584)
at box2d.b2World.Solve (laya.physics.js:799)
at box2d.b2World.Step (laya.physics.js:811)
at Physics.__proto._update (laya.physics.js:1792)
at TimerHandler.__proto.run (laya.core.js:7533)
at Timer.__proto._update (laya.core.js:7271)
at box2d.b2Fixture.GetType (laya.physics.js:430)
at box2d.b2ContactFactory.Create (laya.physics.js:576)
at box2d.b2ContactManager.AddPair (laya.physics.js:586)
at box2d.b2BroadPhase.UpdatePairs (laya.physics.js:308)
at box2d.b2ContactManager.FindNewContacts (laya.physics.js:584)
at box2d.b2World.Solve (laya.physics.js:799)
at box2d.b2World.Step (laya.physics.js:811)
at Physics.__proto._update (laya.physics.js:1792)
at TimerHandler.__proto.run (laya.core.js:7533)
at Timer.__proto._update (laya.core.js:7271)
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kylin9718
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能给个简单的demo吗?