# \[4.11 p5\] Crash during blueprint compile

**URL:** <https://forums.unrealengine.com/t/4-11-p5-crash-during-blueprint-compile/347032>\
**Category:** Blueprint\
**Tags:** custom-event, bug, unreal-engine, crash, question, Blueprint\
**Created:** [February 10, 2016, 5:26pm UTC](https://forums.unrealengine.com/t/4-11-p5-crash-during-blueprint-compile/347032 "2016-02-10T17:26:37Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![TheDrunkenBunny](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@TheDrunkenBunny](https://forums.unrealengine.com/u/TheDrunkenBunny)\
**Post date:** [February 10, 2016, 5:26pm UTC](https://forums.unrealengine.com/t/4-11-p5-crash-during-blueprint-compile/347032/1 "2016-02-10T17:26:37Z")

</div>

Hi,

I’m getting crash related to ClassGeneratedBy being null during blueprint compile. I see that you were tracking this situation (UE-11597 and UE-11595).

Steps to reproduce:

1. Create Blueprint class derived from Actor class. Let call it BP\_Actor.
2. In BP\_Actor create Custom Event with name TestEvent.
3. Compile BP\_Actor.
4. Create Child Blueprint class derived from BP\_Actor. Lets call it BP\_Actor\_Child.
5. In BP\_Actor\_Child add call to TestEvent from BeginPlay event.
6. In BP\_Actor\_Child create Custom Event with the same name as event created in parent class.
7. Compile BP\_Actor.
8. Compile BP\_Actor\_Child and observe compilation error.
9. Compile BP\_Actor and observe crash.

 ![78110-crash.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/e/a/5/ea5272c5216a7b0c119b67702af0d67af69edfa5.png)

---

<div class="post-metadata">

**Author:** ![Sean\_Flint](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Sean\_Flint](https://forums.unrealengine.com/u/Sean_Flint)\
**Post date:** [February 10, 2016, 6:33pm UTC](https://forums.unrealengine.com/t/4-11-p5-crash-during-blueprint-compile/347032/2 "2016-02-10T18:33:45Z")

</div>

Hello,

I have been able to reproduce the crash, and have entered a bug report (UE-26761). Thank you for your report, and for your clear repro steps.

Have a great day