# Blueprint Interface Crash

**URL:** <https://forums.unrealengine.com/t/blueprint-interface-crash/363408>\
**Category:** UI\
**Tags:** interface, unreal-engine, crash, Blueprint, question\
**Created:** [July 8, 2016, 9:22pm UTC](https://forums.unrealengine.com/t/blueprint-interface-crash/363408 "2016-07-08T21:22:59Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![DannRees](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@DannRees](https://forums.unrealengine.com/u/DannRees)\
**Post date:** [July 8, 2016, 9:22pm UTC](https://forums.unrealengine.com/t/blueprint-interface-crash/363408/1 "2016-07-08T21:22:59Z")

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Steps to reproduce the crash from an empty Blueprint project:

1. Create a blueprint interface. Add an output variable to the default (or any) function
2. Create a new blueprint (mine was based on actor)
3. Create a child of the blueprint from step 2
4. Implement the interface on the child blueprint from step 3
5. Create a child of the child blueprint created in step 3
6. Override the interface function in the second child blueprint created in step 5
7. Implement the interface on the original blueprint created in step 2 and click compile
8. Crash

I’ve attached the crash log for your reference.

Thanks

link text

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**Author:** ![anonymous\_user\_61b4a355](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_61b4a355](https://forums.unrealengine.com/u/anonymous_user_61b4a355)\
**Post date:** [July 11, 2016, 6:21pm UTC](https://forums.unrealengine.com/t/blueprint-interface-crash/363408/2 "2016-07-11T18:21:03Z")

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Hey DannRees,

Thank you for the great repro steps. This issue has been logged as: UE-33027 to be reviewed by the development staff.