SEVERE: Uncaught exception thrown in Thread[LWJGL Renderer Thread,5,main]
java.lang.NullPointerException
	at com.bulletphysics.collision.dispatch.CollisionDispatcher.freeCollisionAlgorithm(CollisionDispatcher.java:119)
	at com.bulletphysics.collision.dispatch.CompoundCollisionAlgorithm.destroy(CompoundCollisionAlgorithm.java:76)
	at com.bulletphysics.collision.dispatch.CollisionDispatcher.freeCollisionAlgorithm(CollisionDispatcher.java:120)
	at com.bulletphysics.collision.dispatch.CompoundCollisionAlgorithm.destroy(CompoundCollisionAlgorithm.java:76)
	at com.bulletphysics.collision.dispatch.CollisionDispatcher.freeCollisionAlgorithm(CollisionDispatcher.java:120)
	at com.bulletphysics.collision.broadphase.HashedOverlappingPairCache.cleanOverlappingPair(HashedOverlappingPairCache.java:219)
	at com.bulletphysics.collision.broadphase.HashedOverlappingPairCache.removeOverlappingPair(HashedOverlappingPairCache.java:91)
	at com.bulletphysics.collision.broadphase.DbvtBroadphase.collide(DbvtBroadphase.java:145)
	at com.bulletphysics.collision.broadphase.DbvtBroadphase.calculateOverlappingPairs(DbvtBroadphase.java:235)
	at com.bulletphysics.collision.dispatch.CollisionWorld.performDiscreteCollisionDetection(CollisionWorld.java:139)
	at com.bulletphysics.dynamics.DiscreteDynamicsWorld.internalSingleStepSimulation(DiscreteDynamicsWorld.java:378)
	at com.bulletphysics.dynamics.DiscreteDynamicsWorld.stepSimulation(DiscreteDynamicsWorld.java:339)
	at com.jme3.bullet.PhysicsSpace.update(PhysicsSpace.java:330)
	at com.jme3.bullet.PhysicsSpace.update(PhysicsSpace.java:317)
	at com.jme3.bullet.BulletAppState.render(BulletAppState.java:257)
	at com.jme3.app.state.AppStateManager.render(AppStateManager.java:300)
	at com.jme3.app.SimpleApplication.update(SimpleApplication.java:251)
	at com.jme3.system.lwjgl.LwjglAbstractDisplay.runLoop(LwjglAbstractDisplay.java:151)
	at com.jme3.system.lwjgl.LwjglDisplay.runLoop(LwjglDisplay.java:185)
	at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:228)
	at java.lang.Thread.run(Thread.java:722)

AL lib: (EE) alc_cleanup: 1 device not closed

Exception: java.lang.NullPointerException thrown from the UncaughtExceptionHandler in thread "LWJGL Renderer Thread"