XRLayers causing `InvalidStateError` when leaving and reentering a session

[WawasCode]

I am getting following error when using the r3xr example for XRlayers:

Uncaught InvalidStateError: Failed to execute 'createQuadLayer' on 'XRWebGLBinding': Invalid space passed to function
    at createXRNormalLayer (layer.js:45:50)
    at createXRLayer (layer.js:11:11)

To reproduce:

1. Enter XR
2. Wait for XRLayer to load
3. Leave XR
4. Reenter XR again