# Editor crashes due to a material that contains MPCs migrated from another project

**URL:** <https://forums.unrealengine.com/t/editor-crashes-due-to-a-material-that-contains-mpcs-migrated-from-another-project/1826566>\
**Category:** Issues and Bug Reporting\
**Tags:** fortnite-creative, unreal-editor-for-fortnite, fortnite\
**Created:** [April 28, 2024, 3:36pm UTC](https://forums.unrealengine.com/t/editor-crashes-due-to-a-material-that-contains-mpcs-migrated-from-another-project/1826566 "2024-04-28T15:36:46Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![aiiroIndy](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/aiiroindy/32/915754_2.png) [@aiiroIndy](https://forums.unrealengine.com/u/aiiroIndy)\
**Post date:** [April 28, 2024, 3:36pm UTC](https://forums.unrealengine.com/t/editor-crashes-due-to-a-material-that-contains-mpcs-migrated-from-another-project/1826566/1 "2024-04-28T15:36:46Z")

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### Please select what you are reporting on:

Unreal Editor for Fortnite

### What Type of Bug are you experiencing?

Assets

### Summary

I have migrated a material that contains a Material Parameter Collections from another UEFN project.  
Some behavior with that material caused the editor to crash.

### Steps to Reproduce

1. Select a material containing a MPCs, MPCs, textures, etc. and migrate them to another project. Assets Actions \> Migrate…

2. Open the project you migrated to. (My editor still crashed at this point)

3. My editor crashed for all of the following actions.

- Right-clicking or double-clicking on that material in the content browser
- Selecting that material in the content browser and pressing the delete key.
- Pressing the submit button to check in the project.

### Expected Result

We can migrate materials containing MPCs and open them successfully.  
The migration should not interfere with the check-in of the project.

### Observed Result

See "3. " in Steps to Reproduce

### Platform(s)

Windows

### Additional Notes

I could not delete the material in question, but revert option of URC enabled me to remove it. Then I check-in of the project.

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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:** [April 29, 2024, 2:01am UTC](https://forums.unrealengine.com/t/editor-crashes-due-to-a-material-that-contains-mpcs-migrated-from-another-project/1826566/2 "2024-04-29T02:01:01Z")

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The status of FORT-738544 incident has been moved from ‘Needs Triage’ to ‘To Do’.