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Frequent Random Crash when compiling blueprints

Good Evening,

For one of the larger games I have a team of students working on, every couple times we compile the player blueprint of the game (which is derived from a chain of other parent blueprints), and contains a ton of blueprint code and variables, it will crash out of nowhere during the compile, and set us back on work. When we reopen the browser, and compile again, it will compile fine for a couple times, then it happens again.

Please refer to the attached stack trace.

It's been happening for the past couple versions of the engine, and no updates have managed to fix it. We're using 4.10.2, the straight unmodified download from the launcher with no C++ code and no modifications via github for this project.

Any help would be appreciated.


Product Version: UE 4.10
stack.txt (7.8 kB)
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asked Jan 15 '16 at 01:44 AM in Bug Reports

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avatar image Sean L ♦♦ STAFF Jan 15 '16 at 03:50 PM


After looking into your crash, it seems that there are multiple unique crashes related to your particular project. However, for the time being, we will focus on the one that you posted the Callstack of.

Could you provide any information as far as how we can attempt to reproduce this issue? Can you reproduce this issue in a clean project?

If you convert the project up to the 4.11 Preview, do you see the same crash occurring?

avatar image cornwell Jan 16 '16 at 05:06 AM

Hello Sean,

Thanks. Yes, there are some other nagging crashes as well, but this one is currently the most hindering.

This one is going to be tough to reproduce in a clean project, due to the number of dependencies, as the blueprint causing the crash has hundreds of nodes of blueprint, is derived from a hierarchy of other blueprints, and makes reference to quite a few other blueprints.

Most commonly, this crash is occurring after connecting the input variables from functions to the input variables of other functions in blueprint, then compiling.

I attached a screenshot of what was connected with a red line last time it crashed when compiling right after making the connection.

Is there anything I can run on this end to better track down the problem for you the next time it crashes?

Haven't tried 4.11 yet due to the size of our current project and it being an early preview build still.

Thanks for your help.

screenshot.jpg (127.6 kB)
avatar image Sean L ♦♦ STAFF Jan 18 '16 at 04:53 PM

Could you please provide your logs, located in your project's Saved->Logs folder?

avatar image cornwell Jan 21 '16 at 06:46 AM

Good Evening Sean,

Pardon the delay, it's been a busy week.

Absolutely, please see attached. Unfortunately, there are a number of vague errors in the logs that aren't showing up when compiling the blueprints or opening the maps, and give little context to be able to track down what the cause is.

We appreciate your help. Please let me know what else we can do on this end.

Thank you.

[Side note: The other thing that most often is crashing the engine for us is whenever we right-click on a blueprint node, and add a comment directly to the node. This frequently crashes the engine after inputting the comment. You'll see this as Assertion failed: ParentIndex != INDEX_NONE in some of the logs.]

[1]: /storage/temp/75360-logs.zip

logs.zip (868.8 kB)
avatar image Sean L ♦♦ STAFF Jan 21 '16 at 01:37 PM

Did you grab these logs right after a crash occurred? It looks like the editor was shut down cleanly based on the logs, so if you could reproduce the crash and then get the logs one more time, then we can have a closer look at what the error could be.

Since this crash seems to be related to blueprints in your project, it is likely that we will need to see the project. If you could, please zip up the project and provide a link to Dropbox where we can download it. If you're concerned about privacy, feel free to PM me the link on the forums: https://forums.unrealengine.com/member.php?160394-Sean-Flint

avatar image cornwell Jan 23 '16 at 11:11 PM

Hello Sean,

Thank you for your reply. I grabbed the logs at the time of your request, not right after a crash. I can try and grab the logs the next time it crashes again.

It will take some time to get the project reasonable enough in size to be able to upload for your review, as the students are using a number of large marketplace packs. It may take me a week, give or take, to have the time.

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I am marking this topic as resolved for the time being. When you have the time to provide the crash logs as well as a link to a copy of your project, please re-open this topic by commenting on the thread. Thank you.

Have a great day

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answered Jan 26 '16 at 01:39 PM

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Sean L ♦♦ STAFF
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