Camera.Render() & DockArea:OnGUI() seemingly random & unrelated errors after particles launch

Hello!

I've got a particle system that emits 4000 particles when called in FixedUpdate(). However, there seems to be a few errors that pop up after 2 - 4 emissions.

The errors all point to CardboardEye.cs , which works fine when I don't have any particles emitted. There is documentation regarding CardboardEye.cs but it doesn't seem to be very helpful..

Any ideas on what to look at for the errors? Also, the particle emission seems rather laggy. Is there anyway of optimizing this?

Thanks very much in advanced