[1.1.8] Corrupt map: unkown entity prototype ID 46934

[PE1NUT]

Unable to load my main map after playing around in a different map for a bit. Earlier today I had a Factorio crash while loading the map, then it worked fine again for a while, but now it won't load any more. I have no other autosaves of this map, because the autosave system uses the same filename for autosaves of any map.

Platform: Ubuntu 20.04.

31.084 Loading map /home/paul/factorio/saves/CrescentLake.zip: 71005645 bytes.
31.128 Loading level.dat: 186035442 bytes.
31.136 Info Scenario.cpp:196: Map version 1.1.8-0
32.647 Warning Map.cpp:346: Map loading failed: Corrupt map: unknown entity prototype ID 46934.
32.925 Error AppManagerStates.cpp Corrupt map: unknown entity prototype ID 46934.

[Rseding91]

Thanks for the report; do you have any way to take a known working save and get it into the broken state?

That error means the map is corrupt; so unless you know how to make it happen I'm likely to think your Pc is having hardware issues and corrupted the save.

[PE1NUT]

Thanks for the quick reply. There are no other stability issues on this PC, and storage is on a ZFS filesystem, so disk corruption seems very unlikely.

I have no idea how to reproduce this, just as I have no idea how this did happen. It was a map with >1300 hours on it, which just went *poof*.

Not using any modes, this is a vanilla install.

The autosave system in Factorio really shouldn't overwrite one map with another like it does.