Photoshop crashes when I try to render an image stack

Hi,

I've been creating and rendering smart objects for a project. I've been doing this for the past month without issue. Now though, the program is consistently crashing (usually after allowing me to successfully render one stack). It's not an issue of too many images in the stacks, as there aren't that many and I'm currently using fewer than normal anyway. 

I updated my version of Photoshop and downloaded the new version - the problem persists.

Thanks for your help

M