[Update: Upcoming patch to address issue] Europa Universalis IV (EU4) vassalize nation not working after 1.31.2 update, fix in works

This story is being continuously updated….

Original story (published on May 04) follows:

Europa Universalis IV or EU4 is a popular grand strategy game developed by Paradox Development Studio and published by Paradox Interactive.

It’s available on macOS, Microsoft Windows, and Linux. The game has been around for years and still gets new updates to keep players hanging around.

But it seems that after a recent update — specifically version 1.31.2 — players aren’t able to vassalize nations.

Here are some reports from players for reference.


So i got the new update today the 1.31.2 patch that made it so you can not vassalize during humiliation cb and for some reason i now can’t vassalize at all.conquest CB for land can’t vassalize nation… (Source)

i can not vassalize nations now like wtf u stoped humiliation cb allowing vassalization ok fair engou but now i cant do it at all which really breaks the new nations that i dont know HAVE LOADS OF MISSIONS INVOLVING VASSALS (Source)

1.31.2 broke vassalization peace option. It’s no longer possible to vassalize without a subjugation (or similar) CB… Seriously Paradox… (Source)

Do note that this bug isn’t to be confused for the intentional change that now prevents players from being able to vassalize with the Humiliate CB.

According to reports, Europa Universalis IV players aren’t able to vassalize a nation with most CBs after the 1.31.2 patch.

Since the new nations have many missions that involve vassals, the bug makes the game somewhat unplayable. Although, some Europa Universalis IV players confirm that they are able to vassalize with the subjugation CB.

Fortunately, the game developers were quick to pick up on the reports and have confirmed that they are aware of the new bug and are working on a fix for it.


The team has not yet shared an ETA for the fix. However, now that the bug has been acknowledged officially, players hopefully won’t have to wait too long for the fix to go live.

As usual, we will post an update if and when there are any further developments.

Update 1 (May 07)

Europa Universalis has confirmed on Twitter that the issue will be resolved in the next update. Here’s what they said:

We felt it was important to get a fix out for the save corruption as soon as possible, otherwise people couldn’t play at all. Next patch should resolve the vassalisation issue, and we’re taking more time over testing it.

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Dwayne Cubbins

I've been interested in tech for as long as I can remember. And I used to be a Windows Phone enthusiast. When I am not writing about tech, I'm on the couch playing games with my squad. Oh, I also play the guitar and drums.