[Crash]:When changing defaults in BP which has Light as parent class

Doing the following will crash Rocket 1808360:

  1. In Content Browser, RMB, Blueprint

  2. In Custom…, search for light and select PointLight

  3. Edit the new BP

  4. In the Defaults tab change any parameter that has a slider (for example, Min Roughness)

  5. Observe the crash with following message:

    Fatal error!

    Address = 0x48f6457c (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-Engine.dll]
    Address = 0x48c6fdf2 (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-Engine.dll]
    Address = 0x48c6d599 (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-Engine.dll]
    Address = 0x52999542 (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-CoreUObject.dll]
    Address = 0x4179ef4d (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-PropertyEditor.dll]
    Address = 0x416e17b5 (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-PropertyEditor.dll]
    Address = 0x416e1b21 (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-PropertyEditor.dll]
    Address = 0x4170e350 (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-PropertyEditor.dll]
    Address = 0x41825ced (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-PropertyEditor.dll]
    Address = 0x418107b3 (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-PropertyEditor.dll]
    Address = 0x41811808 (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-PropertyEditor.dll]
    Address = 0x4f7446bb (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-Slate.dll]
    Address = 0x4f7a52d8 (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-Slate.dll]
    Address = 0x4f771d13 (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-Slate.dll]
    Address = 0x4f773158 (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-Slate.dll]
    Address = 0x4f6e62a9 (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-Slate.dll]
    Address = 0x4f80cc05 (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-Slate.dll]
    Address = 0x4f6e791e (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-Slate.dll]
    Address = 0x4f6f0752 (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-Slate.dll]
    Address = 0x4f6e7838 (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-Slate.dll]
    Address = 0x508a88d9 (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-Core.dll]
    Address = 0x5089acca (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-Core.dll]
    Address = 0x508a9556 (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-Core.dll]
    Address = 0x508968d2 (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-Core.dll]
    Address = 0x682a171e (filename not found) [in C:\WINDOWS\system32\USER32.dll]
    Address = 0x682a14d7 (filename not found) [in C:\WINDOWS\system32\USER32.dll]
    Address = 0x508ce559 (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-Core.dll]
    Address = 0x508a9beb (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor-Core.dll]
    Address = 0x18615e64 (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor.exe]
    Address = 0x1860cb8c (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor.exe]
    Address = 0x1860cbfa (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor.exe]
    Address = 0x1861772b (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor.exe]
    Address = 0x186183c3 (filename not found) [in U:\Rocket\Engine\Binaries\Win64\RocketEditor.exe]
    Address = 0x6642167e (filename not found) [in C:\WINDOWS\system32\KERNEL32.DLL]
    Address = 0x68cac3f1 (filename not found) [in C:\WINDOWS\SYSTEM32\ntdll.dll]
    Address = 0x68cac3f1 (filename not found) [in C:\WINDOWS\SYSTEM32\ntdll.dll]

Seems like properties which don’t have the slider will not crash Rocket when their default values are changed.
Same crash seems to happen if Spot light is selected as Parent Class.

Hi Tomas,

Thank you very much for this report. I was able to reproduce this crash in Rocket, as well as our internal build. I have created a report for it, entered it into our database and made it high priority. Strangely, I did not receive any callstack, so I have referenced yours. If you experience any other crashes while exploring lighting with blueprints, please bring them right to us.

Thank you,

Alexander

I think that while I was trying to reproduce the crash by changing different parameters of the BP with Spot light as parent class, once I got a crash with empty callstack. Not sure if it was related to specific parameter or was a random event depending on who knows what.

Any solution for this? I have similar issues with lighting and camera blueprint as the root of the blueprint.
It keep crashing Unreal when I try to modify anything from the root.

Hello,

This is a question from the beta version of the engine. We are marking this answered for tracking purposes. If you are experiencing an issue similar to this please post a new question.

Thank you.