[4.10.1] Crash when applying instance changes to Blueprint

Development Programming & Scripting Blueprint
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1

Hi there,

when I try to write changes to the class defaults of an Blueprint actor instance back to the blueprint, the editor crashes.

575×1036 77.3 KB

Maybe this is an issue with nested structs or something. Here’s the crash log: MachineId:E41A3D4D43CC73524EE9A8AD024CD4DFEpicAccountId:fba125fe5ed14161aba130 - Pastebin.com

2

Hi ,

  • Does this occur in a clean, blank project with no additional content or is it limited to one project?
  • What steps can I take to reproduce this on my end?
  • Is this limited to one type of blueprint?
  • What specific changes are you making that cause this to occur?
  • Can you post your crash logs here? They can be found at \Unreal Projects\PROJECTNAME\saved\logs. The file linked in your thread above is the crash callstack.
3

Ok, I’ll check this on monday and report back.

4

Ok, here are the [crash logs][1]

And here is how to reproduce this bug (phew, took me about an hour to hunt this down):

  • Create a new project
  • Create a struct like this (array of text seems to be the culprit here):

732×311 31.1 KB

  • Create an actor Blueprint
  • Add a single variable for this struct, make it an array
  • Make the variable editable

1050×541 112 KB

  • Insert an instance of this blueprint in the level
  • Add a member to the editable variable (add a member to the text array also, this is what seems to cause the crash later)
  • Now try to save this value back to the blueprint

487×625 45.2 KB

  • Enjoy the crash :slight_smile:

I attached you a super-simple, [ready-to-crash testproject][5], too :wink:

(Empty level with just a single BP_CrashTest)

5

Hi ,

Thank you for the project. I was able to reproduce this and have entered a bug report, UE-24455, to be assessed by the development staff.

6

Thank you.