I'm getting the same error but mine has a size of 0. I know that is in zone 12_4. It's where all my ships and animals are. I wasn't running any mods at the time of the save. All i had done was spawn two animals just through console commands right before I saved. Only thing I can think of that could have caused it. Really don't want to have to spawn on the resources and ships that I'm losing if i just wipe that zone.