UE4Editor crash when reopen a big level

Anonymous_21050bab524c73b6de17482c93147519 · January 11, 2022, 8:04am

We are using UE4.27.1 which was built from source code.

We have a big level, which include 64 streaming children levels. So it need about 10 seconds to load. When the loading is going, reopen this level again(by “cmd open xxx”), the UE4Editor crash definitely. The error happened in this code

and the stack is

From this stack, this error is relative to the Spline Component. So we specially created a new project and tested Spline Component in it. Since the level of the new project is small, and have not enough time to reopen it, we just write a timer to reopen the level repeatedly in Subsystem class.

We tested two kinds of ways of using Spline

Used in Blueprint

Used in Landscape

Both can reappear the same error.

Is it a bug of Spline Component?

To reopen a level is unavoidable in our game, so we have to solve this problem.

Natalo77 · January 11, 2022, 8:39am

Have you tried a potential hack fix by manually destroying splines in your level before re-opening?

Anonymous_21050bab524c73b6de17482c93147519 · January 12, 2022, 6:42am

Not yet, because for the Spline used in Landscape, it is the embedded function of UE, we can’t destroy it in that case.

Natalo77 · January 12, 2022, 8:27am

I’m not sure what to suggest sorry - Hopefully someone else can help you with this.

Anonymous_21050bab524c73b6de17482c93147519 · January 12, 2022, 10:03am

Thanks for your reply.

We found another question which is very similar to our issues.
According to it, We modified this file StaticMesh.cpp , it just make the reopening map normal temporarily.

Natalo77 · January 12, 2022, 10:05am

Wow - Does the original code really just straight up delete pointers without checking them first!?