# Map Controller: custom material crashed client

**URL:** <https://forums.unrealengine.com/t/map-controller-custom-material-crashed-client/2230903>\
**Category:** Issues and Bug Reporting\
**Tags:** fortnite-creative, unreal-editor-for-fortnite, fortnite\
**Created:** [December 18, 2024, 7:26pm UTC](https://forums.unrealengine.com/t/map-controller-custom-material-crashed-client/2230903 "2024-12-18T19:26:27Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![DrillCreative](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/drillcreative/32/872506_2.png) [@DrillCreative](https://forums.unrealengine.com/u/DrillCreative)\
**Post date:** [December 18, 2024, 7:26pm UTC](https://forums.unrealengine.com/t/map-controller-custom-material-crashed-client/2230903/1 "2024-12-18T19:26:27Z")

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### Summary

Assigning a custom map material to the map controller device will cause a client crash when attempting to push changes.  
UEFN then will not push additional changes, requiring a shutdown of the editor, relaunch of both editor and client severely impacting iteration time.

### Please select what you are reporting on:

Creative

### What Type of Bug are you experiencing?

Assets

### Steps to Reproduce

Place Map Controller Device in World.  
Check “Custom map material” = true.  
Assign a custom map material (needs to be material of domain type = UI.)  
Launch map.  
Make changes in scene.  
Save scene.  
Push new changes.

### Expected Result

Map should update as expected and custom minimap should display

### Observed Result

Client crashes.

### Platform(s)

PC

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<div class="post-metadata">

**Author:** ![chrisp\_games](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/chrisp_games/32/895155_2.png) [@chrisp\_games](https://forums.unrealengine.com/u/chrisp_games)\
**Post date:** [December 27, 2024, 6:10pm UTC](https://forums.unrealengine.com/t/map-controller-custom-material-crashed-client/2230903/3 "2024-12-27T18:10:58Z")

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Can confirm this happening! [x.com](https://x.com/chrisp_games/status/1872609280320561654)

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<div class="post-metadata">

**Author:** ![chrisp\_games](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/chrisp_games/32/895155_2.png) [@chrisp\_games](https://forums.unrealengine.com/u/chrisp_games)\
**Post date:** [December 27, 2024, 6:41pm UTC](https://forums.unrealengine.com/t/map-controller-custom-material-crashed-client/2230903/4 "2024-12-27T18:41:21Z")

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Also I am pretty sure the reason is the garbage collector somehow renames the image used in the material and when pushing changes it trys to acess it but it got renamed

 ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/c/3/c/c3c272db7e0dc56949f83390ad22f764c2914c31.png)

After switching to a texture instead of a map material these lines for the textures are no longer in the logs which should mean thats the reason

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<div class="post-metadata">

**Author:** ![Flak](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/flak/32/769441_2.png) [@Flak](https://forums.unrealengine.com/u/Flak)\
**Post date:** [January 24, 2025, 11:51am UTC](https://forums.unrealengine.com/t/map-controller-custom-material-crashed-client/2230903/7 "2025-01-24T11:51:45Z")

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Thank you for the report, @DrillCreative.

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<div class="post-metadata">

**Author:** ![Bug-Reporter](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/bug-reporter/32/997076_2.png) [@Bug-Reporter](https://forums.unrealengine.com/u/Bug-Reporter)\
**Post date:** [February 5, 2025, 1:38pm UTC](https://forums.unrealengine.com/t/map-controller-custom-material-crashed-client/2230903/8 "2025-02-05T13:38:00Z")

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FORT-840084 is ‘Closed’ as ‘Fixed’. The issue will be addressed in 34.00.

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<div class="post-metadata">

**Author:** ![system](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/1/3/713c9d3f58553f0de89543d76a8a3a2779dc9fa4.png) [@system](https://forums.unrealengine.com/u/system)\
**Post date:** [June 16, 2025, 7:26pm UTC](https://forums.unrealengine.com/t/map-controller-custom-material-crashed-client/2230903/9 "2025-06-16T19:26:37Z")

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