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[Bufo]

I'm launching the game with LNP, my fort is 13 years old, I haven't changed any settings, but now DF crashes if I try to load my save.

FATAL ERROR
Missing Interaction Definition: SECRET_SUMMON_N_7

Any ideas?

[A_Curious_Cat]

Have you installed or updated any mods since you started that fort?

[Bufo]

Nope. Never tried any mods (beyond the LNP launcher, if that in itself is a mod.)

Are corrupted saves a regular thing? The world I was playing is completely lost, and I'm disinclined to start another when I don't know what destroyed this one.

Is LNP (with DFHack enabled by default) too risky to use, or does the vanilla game also corrupt saves?

[anewaname]

I think this is some sort of saved game corruption (not related to LNP or dfhack).
- 47.05 has been out for long enough that if this were a bug occurring during the game, it would have shown up before now and there doesn't seem to be any mentions in google, mantisb, or in these DF forums.
- A search of the game folders (which included some saved forts that certainly include necromantic creations) showed the "SECRET_SUMMON" text only exists in the DF executable, so it is likely that during world gen the game creates a set of these necromantic creations, similiar to the FB definitions, and they remain stored in the game saves and loaded into a list when the game is loaded. In your case, item 7 on the list is currently missing.

Because it is likely that the code considers what would happen if a necromancer created a new SECRET_SUMMON_N definition during game play, I suspect a problem occurred during a game save and SECRET_SUMMON_N_7 is the first of a bunch of missing definitions.

I don't know how to prove this or fix your save.

[Bufo]

Thanks, that all sounds reasonable.

I didn't know corrupt saves were a thing. No fun to be had with those.

I guess the workaround is to tell LNP to make backups of my saves. I don't mind losing a season of progress (so long as I can keep the world and the fortress.)