Wow, that was fast, haha! I've just implemented some extra safety checks in the area where 'fluids' are randomly distributed. These checks ensure that if something goes wrong, a 'crude oil' field will always be placed.
Additionally, could you please provide more information? Are you using any additional mods related to resources or scenarios when this issue occurred? I have already tested it on both vanilla and angels+bob's mods (pure bob's is currently not supported), and it worked.