# Crash UE 5.4 project migration from 5.1

**URL:** <https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286>\
**Category:** Programming & Scripting\
**Tags:** unreal-engine, question\
**Created:** [June 6, 2024, 1:01pm UTC](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286 "2024-06-06T13:01:54Z")\
**Posts on this page:** 20\
**Page:** 1

<div class="post-metadata">

**Author:** ![AXL3D2021](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@AXL3D2021](https://forums.unrealengine.com/u/AXL3D2021)\
**Post date:** [June 6, 2024, 1:01pm UTC](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286/1 "2024-06-06T13:01:54Z")

</div>

Hello everyone, I have a strange crash in 5.4. I have created in 5.1 a big map with world partition (around 1000km2) and when I try to convert my project into a 5.4 project, I have this crash message when it try to open the map, can you help me? Message: “Assertion failed: CellIndex \< CellIndexMax [File:D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\SceneCulling\SceneCulling.h] [Line: 172]”

---

<div class="post-metadata">

**Author:** ![Matei](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Matei](https://forums.unrealengine.com/u/Matei)\
**Post date:** [June 10, 2024, 6:04am UTC](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286/2 "2024-06-10T06:04:06Z")

</div>

I have the same problem…I could not find any solution so far. Epic, can you please take a look at this? It seems to be a engine bug…

---

<div class="post-metadata">

**Author:** ![AXL3D2021](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@AXL3D2021](https://forums.unrealengine.com/u/AXL3D2021)\
**Post date:** [June 10, 2024, 2:03pm UTC](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286/3 "2024-06-10T14:03:37Z")

</div>

I have tried many things but nothing is working, I realy NEED to convert my project in 5.4 and I need to do it NOW because I have to release before the end of the month…  
Here is my log file:

[2024.06.10-13.46.01:968][290]LogWindows: Error: appError called: Assertion failed: CellIndex \< CellIndexMax [File:D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\SceneCulling\SceneCulling.h] [Line: 172]

[2024.06.10-13.46.01:968][290]LogWindows: Windows GetLastError: L’opération a réussi. (0)  
[2024.06.10-13.46.06:802][290]LogConsoleManager: Warning: Console variable ‘r.ShaderCompiler.JobCache’ used in the render thread. Rendering artifacts could happen. Use ECVF\_RenderThreadSafe or don’t use in render thread.  
[2024.06.10-13.46.06:802][290]LogThreadingWindows: Error: Runnable thread Foreground Worker #0 crashed.  
[2024.06.10-13.46.06:804][290]LogWindows: Error: === Critical error: ===  
[2024.06.10-13.46.06:804][290]LogWindows: Error:  
[2024.06.10-13.46.06:804][290]LogWindows: Error: Assertion failed: CellIndex \< CellIndexMax [File:D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\SceneCulling\SceneCulling.h] [Line: 172]  
[2024.06.10-13.46.06:804][290]LogWindows: Error:  
[2024.06.10-13.46.06:804][290]LogWindows: Error:  
[2024.06.10-13.46.06:804][290]LogWindows: Error:  
[2024.06.10-13.46.06:804][290]LogWindows: Error: [Callstack] 0x00007ff9c160ecd0 UnrealEditor-Renderer.dll!UnknownFunction   
[2024.06.10-13.46.06:804][290]LogWindows: Error: [Callstack] 0x00007ff9c1658fe1 UnrealEditor-Renderer.dll!UnknownFunction   
[2024.06.10-13.46.06:804][290]LogWindows: Error: [Callstack] 0x00007ff9c15fe848 UnrealEditor-Renderer.dll!UnknownFunction   
[2024.06.10-13.46.06:804][290]LogWindows: Error: [Callstack] 0x00007ff9c080ae3e UnrealEditor-Renderer.dll!UnknownFunction   
[2024.06.10-13.46.06:804][290]LogWindows: Error: [Callstack] 0x00007ff9c07c4804 UnrealEditor-Renderer.dll!UnknownFunction   
[2024.06.10-13.46.06:804][290]LogWindows: Error: [Callstack] 0x00007ffa267924c5 UnrealEditor-Core.dll!UnknownFunction   
[2024.06.10-13.46.06:804][290]LogWindows: Error: [Callstack] 0x00007ffa267921ff UnrealEditor-Core.dll!UnknownFunction   
[2024.06.10-13.46.06:804][290]LogWindows: Error: [Callstack] 0x00007ffa267ba155 UnrealEditor-Core.dll!UnknownFunction   
[2024.06.10-13.46.06:804][290]LogWindows: Error: [Callstack] 0x00007ffa267823d0 UnrealEditor-Core.dll!UnknownFunction   
[2024.06.10-13.46.06:804][290]LogWindows: Error: [Callstack] 0x00007ffa26987c93 UnrealEditor-Core.dll!UnknownFunction   
[2024.06.10-13.46.06:804][290]LogWindows: Error: [Callstack] 0x00007ffa26dec93d UnrealEditor-Core.dll!UnknownFunction   
[2024.06.10-13.46.06:804][290]LogWindows: Error: [Callstack] 0x00007ffa26de02b7 UnrealEditor-Core.dll!UnknownFunction   
[2024.06.10-13.46.06:804][290]LogWindows: Error: [Callstack] 0x00007ffb11897344 KERNEL32.DLL!UnknownFunction   
[2024.06.10-13.46.06:804][290]LogWindows: Error:  
[2024.06.10-13.46.06:804][290]LogWindows: Error: Crash in runnable thread Foreground Worker #0  
[2024.06.10-13.46.06:816][290]LogExit: Executing StaticShutdownAfterError  
[2024.06.10-13.46.06:884][290]LogWindows: FPlatformMisc::RequestExit(1, FRunnableThreadWin::GuardedRun.ExceptionHandler)  
[2024.06.10-13.46.06:884][290]LogWindows: FPlatformMisc::RequestExitWithStatus(1, 3, FRunnableThreadWin::GuardedRun.ExceptionHandler)  
[2024.06.10-13.46.06:884][290]LogCore: Engine exit requested (reason: Win RequestExit)

---

<div class="post-metadata">

**Author:** ![G31](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@G31](https://forums.unrealengine.com/u/G31)\
**Post date:** [June 11, 2024, 3:54pm UTC](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286/4 "2024-06-11T15:54:39Z")

</div>

I have the same problem.  
I think the bug is in the Landscape grass.  
I tried creating a new project in UE 5.4.2.  
I created a new map and a big new landscape.  
I added a blank material, then I added a landscapeGrass node with a scalar 1 connected. The grass is a cube and density 1.  
So far it works.  
The crash occurs when I increase the “end cull distance” of the landscape grass type to something greater than 500000.

---

<div class="post-metadata">

**Author:** ![AXL3D2021](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@AXL3D2021](https://forums.unrealengine.com/u/AXL3D2021)\
**Post date:** [June 11, 2024, 5:22pm UTC](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286/5 "2024-06-11T17:22:12Z")

</div>

In my case Instanced foliage Grid Size is 50000, is that what you mean? Or do you speak about the culling distance into the foliage mode settings?

---

<div class="post-metadata">

**Author:** ![G31](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@G31](https://forums.unrealengine.com/u/G31)\
**Post date:** [June 11, 2024, 5:40pm UTC](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286/6 "2024-06-11T17:40:13Z")

</div>

![Captura](https://d3kjluh73b9h9o.cloudfront.net/original/4X/f/8/e/f8e43e934ca53e911d759b802b40596a39400fd1.png)

I’ve already reported the bug. I’ll post a question on the forum later to see if I get any answers.

---

<div class="post-metadata">

**Author:** ![G31](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@G31](https://forums.unrealengine.com/u/G31)\
**Post date:** [June 11, 2024, 5:41pm UTC](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286/7 "2024-06-11T17:41:19Z")

</div>

Steps to Reproduce:

1- Create a new UE 5.4.2 project  
2- Create a new level. Add lights.  
3- Create a new Landscape (scale it to 3000 in x and y, since it happens at large distances)  
4- Create a new material and apply it to the landscape  
5- Add a LandscapeGrassOutput node  
6- Create a Landscape Grass, apply it to the node and place a scalar with value 1  
7- Place a cube as Grass Mesh, with density = 1. Everything else at default values.  
8- Check that it works.  
9- Increase the “Start Culling Distance” value to the maximum.  
10- Increase the “End Culling Distance” value to the maximum. (I didn’t test it to see what the minimum value is, but it’s higher than 500000)  
11- If the crash hasn’t happened yet, move the camera at high speed through the level.  
12- The Editor closes.  
13- The Crash Reporter appears with the following  
Assertion failed: CellIndex \< CellIndexMax [File:D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\SceneCulling\SceneCulling.h] [Line: 172]

---

<div class="post-metadata">

**Author:** ![AXL3D2021](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@AXL3D2021](https://forums.unrealengine.com/u/AXL3D2021)\
**Post date:** [June 11, 2024, 5:42pm UTC](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286/8 "2024-06-11T17:42:27Z")

</div>

Ok, so this is from the landscape material, the grass setting, I didn’t have the idea to look in it.  
Thank you very much, I will try to do it tonight.

---

<div class="post-metadata">

**Author:** ![AXL3D2021](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@AXL3D2021](https://forums.unrealengine.com/u/AXL3D2021)\
**Post date:** [June 12, 2024, 9:00am UTC](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286/9 "2024-06-12T09:00:09Z")

</div>

I have tried to change those settings but it’s still crashing.  
Did you managed to make it work with this solution?

---

<div class="post-metadata">

**Author:** ![G31](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@G31](https://forums.unrealengine.com/u/G31)\
**Post date:** [June 12, 2024, 11:22pm UTC](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286/10 "2024-06-12T23:22:38Z")

</div>

Not yet. If they answer me, I will tell you.

---

<div class="post-metadata">

**Author:** ![kr0atan85](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@kr0atan85](https://forums.unrealengine.com/u/kr0atan85)\
**Post date:** [June 17, 2024, 6:05am UTC](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286/11 "2024-06-17T06:05:55Z")

</div>

I have the same problem, has anyone been able to fix it?

---

<div class="post-metadata">

**Author:** ![Sharkster-NXR](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/sharkster-nxr/32/1194654_2.png) [@Sharkster-NXR](https://forums.unrealengine.com/u/Sharkster-NXR)\
**Post date:** [June 18, 2024, 10:29pm UTC](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286/12 "2024-06-18T22:29:09Z")

</div>

Same problem here with 5.4.2. Also on a very large map and it may also be foliage related in our project. As this seems to affect projects with large worlds, I’m scared that not that many devs may be affected by this and therefore it’s not going to be a priority fix for Epic. Is there any way to escalate this? Or is all we can do “sit and wait”?

EDIT: Environment was running fine on 5.3

---

<div class="post-metadata">

**Author:** ![PlaceToPlayUA](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@PlaceToPlayUA](https://forums.unrealengine.com/u/PlaceToPlayUA)\
**Post date:** [June 19, 2024, 8:18pm UTC](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286/13 "2024-06-19T20:18:15Z")

</div>

same problem guys( and i don’t have grass, just smal start map

---

<div class="post-metadata">

**Author:** ![AXL3D2021](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@AXL3D2021](https://forums.unrealengine.com/u/AXL3D2021)\
**Post date:** [June 19, 2024, 9:25pm UTC](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286/14 "2024-06-19T21:25:37Z")

</div>

I definitly think it’s an engine bug, I have spend ten’s of hours to try to solve it but I still can’t use 5.4…  
Please HELP!!!

---

<div class="post-metadata">

**Author:** ![Sharkster-NXR](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/sharkster-nxr/32/1194654_2.png) [@Sharkster-NXR](https://forums.unrealengine.com/u/Sharkster-NXR)\
**Post date:** [June 28, 2024, 1:32pm UTC](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286/15 "2024-06-28T13:32:51Z")

</div>

Did you report the bug? Is there a place where we can upvote the importance of it?

Our latest tests show that it’s probably not foliage related, but simply happens when you have “too much” loaded into the editor at the same time. What “too much” means, seems to be dependent on the individual’s machine. The bug makes it pretty much impossible to work on big open worlds at the moment, so it actually IS a high priority thing that should be fixed ASAP.

---

<div class="post-metadata">

**Author:** ![AXL3D2021](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@AXL3D2021](https://forums.unrealengine.com/u/AXL3D2021)\
**Post date:** [June 28, 2024, 11:44pm UTC](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286/16 "2024-06-28T23:44:34Z")

</div>

It’s possible that it’s related with this, my map is very big and with many actors in it.  
I didn’t report it, I don’t know how to do it. If you know where, can you tell me please?

---

<div class="post-metadata">

**Author:** ![Sharkster-NXR](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/sharkster-nxr/32/1194654_2.png) [@Sharkster-NXR](https://forums.unrealengine.com/u/Sharkster-NXR)\
**Post date:** [June 29, 2024, 12:14am UTC](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286/17 "2024-06-29T00:14:19Z")

</div>

I reported the bug right now. I’ll post again when it has a valid ticked id.

---

<div class="post-metadata">

**Author:** ![AXL3D2021](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@AXL3D2021](https://forums.unrealengine.com/u/AXL3D2021)\
**Post date:** [June 30, 2024, 9:00am UTC](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286/18 "2024-06-30T09:00:57Z")

</div>

Thank you very much, It’s a very important point, I have developped a huge world in 5.1 and I need to convert in 5.4 urgently.

---

<div class="post-metadata">

**Author:** ![AXL3D2021](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@AXL3D2021](https://forums.unrealengine.com/u/AXL3D2021)\
**Post date:** [July 5, 2024, 11:16am UTC](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286/19 "2024-07-05T11:16:23Z")

</div>

Hello, do you have any news from epic?

---

<div class="post-metadata">

**Author:** ![Sharkster-NXR](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/sharkster-nxr/32/1194654_2.png) [@Sharkster-NXR](https://forums.unrealengine.com/u/Sharkster-NXR)\
**Post date:** [July 9, 2024, 12:10am UTC](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286/20 "2024-07-09T00:10:17Z")

</div>

No. I have a case number for my report, but I never received a ticket number (or a link) for the bug. No idea what that even means. I can only hope that the bug was already reported. It’s kinda sad to not even get a notification or some sort of reply.

[Next page](https://forums.unrealengine.com/t/crash-ue-5-4-project-migration-from-5-1/1892286.md?page=2)