NEW: CAS Marriage Fix
Have you heard about the CAS marriage bug that started sometime in the last few months? Or maybe you've had it happen to YOUR Sims? Here's the EA bug thread about it: https://forums.ea.com/idea/the-sims-4-bug-reports-en/married-couples-become-unmarriedpartners-after-entering-cas/13524609.
Basically, spouse Sims are getting unmarried after they go into and out of CAS. I hadn't had this happen in my game because I wasn't playing with any married couples, but I heard the topic come up in so many Sims-related conversations on the community Discords that I decided to start digging.
What I found in my tests was that the spouse relationship was actually being removed by the time CAS loaded, because the affected Sims would already be labeled "Partner" if you looked at their relationships in CAS. I was able to replicate this issue with every couple married through gameplay, but noted that the bug did NOT happen with couples married directly through CAS.
Through extensive logging and scouring the game's relationship code, I found that the spouse pointer is already zeroed by the time the household loads into CAS, which is why the couple reads as "Partner" in there. The permanent damage happens on the way back out of CAS: when the game reloads the household, it compares that empty pointer against the family tree, sees a mismatch, decides the Sim was never married, and deletes the marriage to match. Lot-to-lot travel never triggers it, only CAS and Manage Worlds, because those are the transitions that fully tear down and rebuild the household.
What I could not determine was WHY the spouse pointer is getting zeroed out, but what I learned was enough to put together a remedy that should hold people over until EA addresses the root cause. CAS Marriage Fix keeps your Sims in wedded bliss by restoring the missing spouse pointer from the family tree at the exact moment the household reloads, before the game makes that reconciliation comparison. The mismatch never happens, so the marriage is never torn down. Your couples come out of CAS still married. Yay!
What it does and doesn't do
Prevents the loss of marriage on CAS and Manage Worlds trips. That's the main thing.
Sims still read as partners while you're inside CAS. The pointer is already gone by then; the repair happens on the way back out.
It CANNOT recover a marriage that was already lost and saved. Once the broken state is saved, the family tree link is gone too and there's nothing to restore from. If it already happened to you, load a save from before the loss, or remarry your Sims in CAS directly.
It doesn't fix EA's underlying CAS code. It just prevents the damage that code causes.
Install: download, unzip, drop the deadlystingnyc_cas_marriage_fix folder into your Mods folder, ensuring that Script Mods are on.
As this is a much-requested fix for a widespread bug, I am making it available on this post directly before it passes CurseForge moderation. Happy Simming!
EDIT: Now available on CurseForge too!
© 2026 deadlystingnyc. Free for personal use. Do not redistribute or reupload without permission.
Comments (10)
Can you still keep this mod after the September update, instead of making it obsolete? There are plenty of official bug fixes that were broken by a later update (like the incest bug that always came back after supposedly being fixed).
I have no plans to stop hosting this mod after the patch fix is released. Hopefully it will be truly redundant post patch, but I recognize not everyone updates immediately so this will remain available, though it will likely not need or receive further updates.
Could you do something similar for secret lovers? The same thing is happening: couples who are secret lovers become "partners" when entering CAS and/or reloading the game, which messes up the secret-child storyline. See here: https://forums.ea.com/idea/the-sims-4-bug-reports-en/rl-entering-casloading-in-changes-secret-lovers-into-partners/13569735 I would appreciate it SO MUCH!!! Thanks!
It may be a very similar issue, I'll look into it!
Poderia fazer algo similar para amantes secretos? Está acontecendo o mesmo, casais que são amantes secretos se tornam parceiros ao entrar no CAS e/ou sair e voltar no jogo, o que atrapalha o enredo de filhos secretos. Veja: https://forums.ea.com/idea/the-sims-4-bug-reports-en/rl-entering-casloading-in-changes-secret-lovers-into-partners/13569735 Te agradeceria MUITOOO!!! Obrigada!
Would it be possible to develop a mod that allows you to assign parents to a Sim that’s already been made? There’s a bug that only allows you to set 1 sim as a parent, and then you can’t edit the relationship further in CAS or with mods
I have a lot of mods and mod updates in flight right now, but I will put that on the investigation list!
The CAS situation makes me so anxious, between this and the weird hiccup when you swap a sim's gender in CAS creation (I reported this to Sejian when I noticed it and they looked into it a bit). But if you don't know what I'm referring to, when you swap genders it throws all the "default" gender settings in the menus out of whack/sync (pregnancy, toilet, etc). Sejian said the game seems to correct itself once exiting CAS but I'm too nervous to create new families with everything these days X'D thanks for easing that a bit!
Hmm, I haven't experimented with gender changing in CAS. So you're saying that if i change a male to female, she'll still have a stand to pee style and no pregnancy option?
Thanks!