I’ve discovered some very strange behavior with my Session Frontend. This is the first time I’ve ever used the session frontend in this project and one of my first times ever, but whenever I open it via Window → Developer Tools → Session Frontend my .sln reports this error as I am running the editor:
Exception thrown at 0x00000000680C4361 (dbghelp.dll) in UE4Editor-Win64-DebugGame.exe: 0xC0000005: Access violation reading location 0x0000000000000000.
I’ve tried building UnrealFrontend via my UE4 source build solution and as well as my project solution and have been able to successfully run Unreal Frontend standalone. However doing it via editor crashes.
Steps to Reproduce:
Run debugger for UE4 4.26 project via VS 2019
Open Frontend Session via Window → Developer Tools → Frontend Session
Wait a few seconds
See a breakpoint hit with exception
Top function call in the call stack is
if( SymGetSymFromAddr64( ProcessHandle, ProgramCounter, nullptr, Symbol ) )
in Engine\Source\Runtime\Core\Private\Windows\WindowsPlatformStackWalk.cpp
Followed by a bunch of other non-project calls.
I’m not sure where to find the crash dump or log files, its not in the project Saved/Crashes nor is there a crashes folder in the UE4 source build Saved directory
If this is helpful, the last thing in the output before the crash is: ‘UE4Editor-Win64-DebugGame.exe’ (Win32): Loaded ‘C:\Windows\System32\psapi.dll’.
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The version of dbghelp.dll supplied with the engine is soooooooooo old it can’t handle the latest debug info output by the compiler. My Visual Studio 2019 updated yesterday to 16.8.4 and looks like it came with a new dbghelp.dll so I copied that into the engine folder and no more crashes. On mine, the new dll was in
This solution has worked for me. Deleting the DLL loads the Windows one, and UE4editor opens all fine with the SessionFrontend open.
‘UE4Editor.exe’ (Win32): Loaded ‘C:\Windows\System32\dbghelp.dll’.