Crash after migrating to 4.6 on open Blueprint

Development Programming & Scripting Blueprint
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1

Hi, I upgraded my 4.51 project to 4.6 (from the launcher). It opens the project fine but crashes if I open ANY blueprint, either my own or from the Engine directory. Here is the stack trace:

MachineId:8177C80741D13FBBAF5B8DAFB02BA99F
EpicAccountId:930d6f72eb1a4ab7917b028f585694b1

Unknown exception - code 00000001 (first/second chance not available)

Fatal error: [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.6\Engine\Source\Runtime\CoreUObject\Private\Templates\Casts.cpp] [Line: 11]
Cast of nullptr to Blueprint failed

KERNELBASE + 24684 bytes
UE4Editor_Core + 3092333 bytes
UE4Editor_Core + 1597375 bytes
UE4Editor_CoreUObject + 369143 bytes
UE4Editor_Engine + 1794732 bytes
UE4Editor_Engine + 2068206 bytes
UE4Editor_BlueprintGraph + 836200 bytes
UE4Editor_BlueprintGraph + 833813 bytes
UE4Editor_BlueprintGraph + 808020 bytes
UE4Editor_BlueprintGraph + 1023659 bytes
UE4Editor_BlueprintGraph + 608001 bytes
UE4Editor_UnrealEd + 9615636 bytes
UE4Editor_Engine + 1970451 bytes
UE4Editor_CoreUObject + 240849 bytes
UE4Editor_CoreUObject + 946774 bytes
UE4Editor_CoreUObject + 1054484 bytes
UE4Editor_CoreUObject + 944791 bytes
UE4Editor_CoreUObject + 947419 bytes
UE4Editor_CoreUObject + 1062891 bytes
UE4Editor_CoreUObject + 1460613 bytes
UE4Editor_CoreUObject + 1193007 bytes
UE4Editor_CoreUObject + 1189666 bytes
UE4Editor_CoreUObject + 1193874 bytes
UE4Editor_CoreUObject + 1189666 bytes
UE4Editor_CoreUObject + 1189156 bytes
UE4Editor_CoreUObject + 976397 bytes
UE4Editor_CoreUObject + 1185872 bytes
UE4Editor_CoreUObject + 951800 bytes
UE4Editor_CoreUObject + 1026078 bytes
UE4Editor_CoreUObject + 1460171 bytes
UE4Editor_CoreUObject + 1193007 bytes
UE4Editor_CoreUObject + 1189666 bytes
UE4Editor_CoreUObject + 1193874 bytes
UE4Editor_CoreUObject + 1189666 bytes
UE4Editor_CoreUObject + 1189156 bytes
UE4Editor_CoreUObject + 976397 bytes
UE4Editor_CoreUObject + 1185872 bytes
UE4Editor_CoreUObject + 951800 bytes
UE4Editor_CoreUObject + 1026078 bytes
UE4Editor_CoreUObject + 1460171 bytes
UE4Editor_CoreUObject + 1193007 bytes
UE4Editor_CoreUObject + 1189666 bytes
UE4Editor_CoreUObject + 1193874 bytes
UE4Editor_CoreUObject + 1189666 bytes
UE4Editor_CoreUObject + 1189156 bytes
UE4Editor_CoreUObject + 976397 bytes
UE4Editor_CoreUObject + 1185872 bytes
UE4Editor_CoreUObject + 951800 bytes
UE4Editor_CoreUObject + 1026078 bytes
UE4Editor_CoreUObject + 1460171 bytes
UE4Editor_CoreUObject + 1511826 bytes
UE4Editor_CoreUObject + 1580292 bytes
UE4Editor_Kismet + 1245092 bytes
UE4Editor_Kismet + 725992 bytes
UE4Editor_Kismet + 1181122 bytes
UE4Editor_Kismet + 2232182 bytes
UE4Editor_AssetTools + 928397 bytes
UE4Editor_UnrealEd + 11017949 bytes
UE4Editor_AssetTools + 537065 bytes
UE4Editor_ContentBrowser + 1843730 bytes
UE4Editor_ContentBrowser + 1342247 bytes
UE4Editor_ContentBrowser + 1386087 bytes
UE4Editor_ContentBrowser + 1891974 bytes
UE4Editor_ContentBrowser + 1336641 bytes
UE4Editor_ContentBrowser + 1382442 bytes
UE4Editor_ContentBrowser + 1371670 bytes
UE4Editor_ContentBrowser + 1977407 bytes
UE4Editor_ContentBrowser + 1892559 bytes
UE4Editor_Slate + 428894 bytes
UE4Editor_Slate + 157325 bytes
UE4Editor_Slate + 829529 bytes
UE4Editor_Slate + 768779 bytes
UE4Editor_Core + 2484300 bytes
UE4Editor_Core + 2400747 bytes
UE4Editor_Core + 2489259 bytes
UE4Editor_Core + 2387170 bytes
user32 + 9268 bytes
user32 + 8855 bytes
UE4Editor_Core + 2490470 bytes
UE4Editor!FEngineLoop::Tick() + 3434 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\launchengineloop.cpp:2193]
UE4Editor!GuardedMain() + 479 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\launch.cpp:131]
UE4Editor!GuardedMainWrapper() + 26 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() + 249 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]

2

This looks very similar to my issue, too.

3

Kenimica, maybe its the same issue but I cant see a solution… Do I have to use the latest preview source version from Github ? Or can the launcher update 4.6 to 4.61 ?

4

Hey guys,

The good news is that they’re different crashes! The bad news is that they’re different crashes. Kenomica’s crash is due to Slate, which refers to the engine’s user interface, displays, widgets, and so on. Your crash is caused by a failed cast - which is the same issue seen in this thread. I’ll add your crash to the internal report for AGPStudios’ crash and we’ll get back to you ASAP.

Thanks,

Jonathan

5

Please, test if PR 682 applied on top of 4.6 fixes your issue.