VTK To Blender Particles rendering is unreliable

[tkeskita]

When rendering large number of particle instances produced with the new VTK To Blender Particles node, there can occur an error which is shown as debug message like

AttributeError: Writing to ID classes in this context is not allowed: NodeTree, NodeTree datablock, error setting BVTK_Node_VTKToBlenderParticlesType.quats

When the error occurs, the render shows no particles, and rendering hangs.

This seems to be an issue in Blender. It comes up less often when rendering is done in new window compared to rendering in Image Editor. Need more bisecting to pinpoint the problem, please let me know if you get more information when this occurs and when not.