just gave it a try...
setting Octane as the render engine in the render settings and clicking on the cinema internal 'render view' gives me a nice Octane render in the editor window. and it's fast.
clicking the Octane button 'start Octane render' leads to a crash like mentioned above.
clicking the cinema button 'render in picture viewer' sends the scene to Octane but after more than 6mins+ 'preparing...' I guess there is nothing to show up. rendering the internal preview is was faster in sending the scene so I guess it crashed, just doesn't want to admit it.