The error report is like this:

Unhandled exception C0000005 (EXCEPTION_ACCESS_VIOLATION) at address 0x00007FF7D88E2B6A

Stack Trace:
1 stellaris.exe PHYSFS_swapULE64 (+ 859018)
2 stellaris.exe PHYSFS_swapULE64 (+ 855741)
3 stellaris.exe PHYSFS_swapULE64 (+ 847672)
4 stellaris.exe PHYSFS_swapULE64 (+ 844742)
5 stellaris.exe PHYSFS_swapULE64 (+ 846115)
6 stellaris.exe PHYSFS_swapULE64 (+ 846057)
7 stellaris.exe PHYSFS_swapULE64 (+ 846128)
8 stellaris.exe PHYSFS_swapULE64 (+ 846128)
9 stellaris.exe PHYSFS_swapULE64 (+ 991842)
10 stellaris.exe PHYSFS_swapULE64 (+ 12497065)
11 stellaris.exe PHYSFS_swapULE64 (+ 815225)
12 stellaris.exe PHYSFS_swapULE64 (+ 815313)
13 stellaris.exe PHYSFS_swapULE64 (+ 815225)
14 stellaris.exe PHYSFS_swapULE64 (+ 13100260)
15 stellaris.exe PHYSFS_swapULE64 (+ 13100051)
16 stellaris.exe PHYSFS_swapULE64 (+ 13096947)
17 stellaris.exe PHYSFS_swapULE64 (+ 815225)
18 stellaris.exe PHYSFS_swapULE64 (+ 815313)
19 stellaris.exe PHYSFS_swapULE64 (+ 815225)
20 stellaris.exe PHYSFS_swapULE64 (+ 815313)
21 stellaris.exe PHYSFS_swapULE64 (+ 12471304)
22 stellaris.exe PHYSFS_swapULE64 (+ 815313)
23 stellaris.exe PHYSFS_swapULE64 (+ 819593)
24 stellaris.exe PHYSFS_swapULE64 (+ 2973897)
25 stellaris.exe PHYSFS_swapULE64 (+ 1909624)
26 stellaris.exe PHYSFS_swapULE64 (+ 570700)
27 stellaris.exe PHYSFS_swapULE64 (+ 524928)
28 stellaris.exe PHYSFS_swapULE64 (+ 14316171)
29 stellaris.exe PHYSFS_swapULE64 (+ 261373)
30 stellaris.exe PHYSFS_swapULE64 (+ 1097402)
31 stellaris.exe PHYSFS_swapULE64 (+ 14240114)
32 stellaris.exe PHYSFS_swapULE64 (+ 14241608)
33 stellaris.exe (function-name not available) (+ 0)
34 stellaris.exe (function-name not available) (+ 0)
35 stellaris.exe SDL_wcslen (+ 1939866)
36 stellaris.exe SDL_wcslen (+ 1582246)
37 KERNEL32.DLL BaseThreadInitThunk (+ 20)
38 ntdll.dll RtlUserThreadStart (+ 33)
39 ntdll.dll RtlUserThreadStart (+ 33)

I am also pretty sure it is ACOT causing the issues, as it generates tons of errors on startup regarding other mods, like Gigastructural Egnineering. It just doesn't crash the system on loading the game.

I have the same issue with the Fallen Empire but my game crashes in endgame before I even get to finish the project for Stellarite power.

引用自 BlackKaiserDrake：

I have the same issue with the Fallen Empire but my game crashes in endgame before I even get to finish the project for Stellarite power.

That's my bug exactly. I think it might have to do with empires getting/not getting access to stellarite weaponry.

yeah I just went through the logs and this mod makes so many errors

I'm pretty sure this is the same thing happening to my game. My game just started crashing randomly and the only thing I did recently was start the research "The Stars Beckon". So I canceled the research and now it runs fine with no crashes.

same problem here , before some changes were made i reached the stellarite tech level but now it crashes , cant even finish a game
either its a mod issue or a different one is fiddling around , no idea why but i think the former is the case that this mod is highly unstable now when it comes to stellarite power unlock

edit : i suggest the creator to move this option to the AI assistent you get when researching alpha tech

Would like to state that this haves been already reported on the discord and stuff like that.
From my assumption its a mod incompatibility. (because i havent accually crashed doing Chain, end game/curator and all).

Are u using irony mod manager? I have same issuse but after I reset all mods and using vanila launcher there no crash

引用自 H11DN-D4NG3R：

Would like to state that this haves been already reported on the discord and stuff like that.
From my assumption its a mod incompatibility. (because i havent accually crashed doing Chain, end game/curator and all).

Well, yeah. It appears incompatible with Gigastructures, which is kinda funny given the latter mentions one should use mods like these in particular for its mod-specific hard challenges. And it likely has to do with weapon or tech allocation by ACOT not applying properly to the latter's crisis empires.

If it is pushed to the discord, then hopefully it might get fixed in the future.

引用自 Dekker (dragon warrior)：

Are u using irony mod manager? I have same issuse but after I reset all mods and using vanila launcher there no crash

Using what? I've never heard of Irony mod manager. I've always used the unmodified launcher. It crashes me nonetheless.

well i´m not even using gigastructures but some other mods that add ethic specific techs and buildings and it worked before , now it just crashes the moment i do the science convention for stellarite , game even crashes when AI is researching it

引用自 Spirit：

well i´m not even using gigastructures but some other mods that add ethic specific techs and buildings and it worked before , now it just crashes the moment i do the science convention for stellarite , game even crashes when AI is researching it

So the Ethics mods I use also cause the crash? Oh dear...

Sorry for double-posting, but I was wondering if this bug is resolved in the current version, as I'm wary of starting a game to only find out it crashes again in the endgame. Discord is a bit of a maze for me.