# Unreal Engine 5 crashes when adding objects

**URL:** <https://forums.unrealengine.com/t/unreal-engine-5-crashes-when-adding-objects/519402>\
**Category:** Platform & Builds\
**Tags:** unreal-engine, UE5-0, question, troubleshooting\
**Created:** [April 8, 2022, 12:42am UTC](https://forums.unrealengine.com/t/unreal-engine-5-crashes-when-adding-objects/519402 "2022-04-08T00:42:19Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![serubi](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/serubi/32/469158_2.png) [@serubi](https://forums.unrealengine.com/u/serubi)\
**Post date:** [April 8, 2022, 12:42am UTC](https://forums.unrealengine.com/t/unreal-engine-5-crashes-when-adding-objects/519402/1 "2022-04-08T00:42:19Z")

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Hi,

I have a fresh install of Unreal Engine 5 on Windows 10. Whenever I create/load a project, and then try to add any object to my level, the engine immediately crashes with the following error message:

> Assertion failed: MacAddress.Num() == 6 [File:D:\build++UE5\Sync\Engine\Source\Runtime\Engine\Private\LevelActor.cpp] [Line: 292]

It happens seemingly no matter how I introduce new objects to my level — whether it’s adding them from the menu, dragging & dropping, or copy & pasting something.

I’m completely new to UE, so excuse me if there’s something I’m missing. I have tried Googling the problem, but nothing helpful has come up.

I hope someone here can help me 🙏

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**Author:** ![uJelleh](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@uJelleh](https://forums.unrealengine.com/u/uJelleh)\
**Post date:** [April 9, 2022, 1:31am UTC](https://forums.unrealengine.com/t/unreal-engine-5-crashes-when-adding-objects/519402/2 "2022-04-09T01:31:51Z")

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So as it turns out, MacAddress is literally referring to your networks on your PC. 1. I had a ton of disconnected virtual network adapters piled up, so I disabled them all, and now I can place actors in my levels without it crashing.

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<div class="post-metadata">

**Author:** ![serubi](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/serubi/32/469158_2.png) [@serubi](https://forums.unrealengine.com/u/serubi)\
**Post date:** [April 10, 2022, 2:02pm UTC](https://forums.unrealengine.com/t/unreal-engine-5-crashes-when-adding-objects/519402/3 "2022-04-10T14:02:17Z")

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Woah… what an unlikely solution to such an odd problem. But sure enough, disabling all my inactive network adapters fixed it! Thank you for sharing the solution with us 🙂

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**Author:** ![Mr\_TEN](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/mr_ten/32/692033_2.png) [@Mr\_TEN](https://forums.unrealengine.com/u/Mr_TEN)\
**Post date:** [April 30, 2023, 8:20pm UTC](https://forums.unrealengine.com/t/unreal-engine-5-crashes-when-adding-objects/519402/4 "2023-04-30T20:20:50Z")

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重启电脑后解决了, 奇怪的问题

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**Author:** ![KuclingHitam](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@KuclingHitam](https://forums.unrealengine.com/u/KuclingHitam)\
**Post date:** [March 31, 2024, 2:22pm UTC](https://forums.unrealengine.com/t/unreal-engine-5-crashes-when-adding-objects/519402/5 "2024-03-31T14:22:11Z")

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i always crashing when i adding some object like a prop or other,and there is notification like this:  
LoginId:0c165adc4ac041e99524a2b0cdf02a6a  
EpicAccountId:c59c1f340583406fa7f325764f4a5128

Unhandled Exception: EXCEPTION\_ACCESS\_VIOLATION reading address 0xffffffffffffffff

nvwgf2umx  
nvwgf2umx  
nvwgf2umx  
nvwgf2umx  
nvwgf2umx  
nvwgf2umx  
D3D12Core  
dxgi  
dxgi  
dxgi  
dxgi  
dxgi  
dxgi  
dxgi  
UnrealEditor\_D3D12RHI  
UnrealEditor\_D3D12RHI  
UnrealEditor\_D3D12RHI  
UnrealEditor\_RHI  
UnrealEditor\_RHI  
UnrealEditor\_RHI  
UnrealEditor\_RHI  
UnrealEditor\_Core  
UnrealEditor\_Core  
UnrealEditor\_RenderCore  
UnrealEditor\_Core  
UnrealEditor\_Core  
kernel32  
ntdll