Unreal 5.5.1 Crash when I switch to Landscape Mode

The only way I can work on the landscape of my project is by verifying the integrity of the the engine, start a fresh project, copy the EditorPerProjectUserSettings.ini from the new project and past in the defective one. This solution doesn’t always work. It’s pretty random and I can’t find any solution to fix it.

I also tried to the 88DefaultAlpha Texture** but this solution didn’t work.

If you have any idea what is the issue and how to fix it, please let me know. Thank you.

Assertion failed: (DefaultAlphaTexture != nullptr) && DefaultAlphaTexture->Source.IsValid() [File:D:\build++UE5\Sync\Engine\Source\Editor\LandscapeEditor\Private\LandscapeEditorObject.cpp] [Line: 541]

UnrealEditor_LandscapeEditor
UnrealEditor_LandscapeEditor
UnrealEditor_LandscapeEditor
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_LevelEditor
UnrealEditor_LevelEditor
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
user32
user32
UnrealEditor_ApplicationCore
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
kernel32
ntdll

Hey there @SKIROW! Does this occur with all landscapes with or without a height map on this one project alone? Is the texture it’s referencing still there?

Only the one with height map. I reinstalled Unreal few times, and modified my landscape material and now it doesn’t crash anymore. I wish I knew what fixed the issue. Thank you for your reply.

Hi, I had the same issue. I just opened a new project and migrated the level and material file to the new one. When I started the new project I could open the level map and when I switch to Landscape mode no problems occured. I could manage to paint the landscape. I checked if it will work fine or not after I save all and quit. No problems occured. This is not an ideal way, but saved my day.

Hey there @yagizakay! Welcome to the community! Thanks for the heads up on that fix! With Skirow’s answer as well, I’m thinking it had to be some form of cached data that was causing an issue. So anyone in the future reading this may be able to correct it by clearing all of the Unreal caches or transferring projects if it’s small enough.

1 Like

Hi, I am having the problem that 5.5.1 will simply freeze when I go to Landscape mode - does that mean I have to clear the “Unreal cache”? It is my first project, and there is nothing in the “Derived Cache” folder of my first project if that’s what you mean, so I am not sure what to do. I am literally 5 minutes into a basic Unreal Engine tutorial and it will crash/freeze when I go to Landscape mode. Help, please?

Hey there @Richard_Zeiss! Welcome to the community! If possible, could I see the crash context log? This video can show you how to install the editor symbols and retrieve the log.

Disclaimer: One or more of these links are unaffiliated with Epic Games. Epic Games is not liable for anything that may occur outside of this Unreal Engine domain. Please exercise your best judgment when following links outside of the forums.

Hi there, thanks very much! Much to my delight, the most recent update - 5.5.2 - seems to have resolved the issue!

1 Like

Thanks for the update! If the issue occurs again, let me know! I’m tracking the same issue for another user that the update didn’t seem to help.