Render goes blank when automating render queue

Dafa

So I made a quick homemade render queue that changes the orientation of a few objects after each render but randomly the renderer would output a blank/black image at times.

I tried sleeping and calling processEvents() but nothing seems to work. Any idea as to how to fix this issue?

var oRenderMgr = App.getRenderMgr();var oSelectedNode = Scene.getPrimarySelection();var oRenderOptions = oRenderMgr.getRenderOptions();// Rotates node via given DzQuat.function rotate(quat, node) {    //...}rotate(someQuat, oSelectedNode);processEvents();oRenderMgr.doRender(oRenderOptions);

It happens for both 3Delight and Iray. I'm not sure about Filament.