UE4 4.12.4 crashes on Dedicated Server Mode

Development Programming & Scripting
1

Hey,

like the topic says the ue4 engine suddenly starts to crash every time I want to test the game in dedicated server mode. This already happened to me a few days ago - I fixed it with a full build of the game - Now it’s happening again and I cant fix it :frowning:

Error log of the Engine:

Assertion failed:
Property->PropertyFlags & CPF_Net
[File:D:\Build++UE4+Release-4.12+Compile\Sync\Engine\Source\Runtime\Engine\Private\RepLayout.cpp]
[Line: 2666]

UE4Editor_Core!FDebug::AssertFailed()
[d:\build++ue4+release-4.12+compile\sync\engine\source\runtime\core\private\misc\outputdevice.cpp:440]
UE4Editor_Engine!FRepLayout::InitFromObjectClass()
[d:\build++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\replayout.cpp:2668]
UE4Editor_Engine!UNetDriver::GetObjectClassRepLayout()
[d:\build++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\networkdriver.cpp:3314]
UE4Editor_Engine!UNetDriver::FindOrCreateRepChangedPropertyTracker()
[d:\build++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\networkdriver.cpp:3298]
UE4Editor_Engine!AActor::CallPreReplication()
[d:\build++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\actor.cpp:907]
UE4Editor_Engine!UNetDriver::ServerReplicateActors_BuildConsiderList()
[d:\build++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\networkdriver.cpp:2444]
UE4Editor_Engine!UNetDriver::ServerReplicateActors()
[d:\build++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\networkdriver.cpp:2923]
UE4Editor_Engine!UNetDriver::TickFlush()
[d:\build++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\networkdriver.cpp:294]
UE4Editor_Engine!TBaseUObjectMethodDelegateInstance<0,UNetDriver,void
__cdecl(float)>::ExecuteIfSafe() [d:\build++ue4+release-4.12+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:852]
UE4Editor_Engine!TBaseMulticastDelegate::Broadcast()
[d:\build++ue4+release-4.12+compile\sync\engine\source\runtime\core\public\delegates\delegatesignatureimpl_variadics.inl:921]
UE4Editor_Engine!UWorld::Tick()
[d:\build++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\leveltick.cpp:1327]
UE4Editor_UnrealEd!UEditorEngine::Tick()
[d:\build++ue4+release-4.12+compile\sync\engine\source\editor\unrealed\private\editorengine.cpp:1349]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick()
[d:\build++ue4+release-4.12+compile\sync\engine\source\editor\unrealed\private\unrealedengine.cpp:368]
UE4Editor!FEngineLoop::Tick()
[d:\build++ue4+release-4.12+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2775]
UE4Editor!GuardedMain()
[d:\build++ue4+release-4.12+compile\sync\engine\source\runtime\launch\private\launch.cpp:148]
UE4Editor!GuardedMainWrapper()
[d:\build++ue4+release-4.12+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain()
[d:\build++ue4+release-4.12+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:200]
UE4Editor!__scrt_common_main_seh()
[f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32 ntdll

2

Bump - Problem is still there :confused:

3

I deleted a map out of my content folder and it’s fixed.
Is it possible that an unused map canmake those errors?

4

Now after a few days again - UE4 is crashing on In-Editor starts until I delete ALL maps.
I downgraded my project to 4.11 again - But I really want to know the problem here?

So - BUMP

5

Check here, maybe you have something to add to my post.

6

Got similar crashes here with same stack, only for me it happens when I run a multiplayer listen server and client(s) in editor.

This has started happening a while ago but has come to the point where it is near impossible to debug a multiplayer game.
Have recently upgraded to 4.12 and problem persists…
If more info is needed please specify what will be useful

7

4.12.5 still having this issue with several projects. Any input from the devs?

8

Did you manage to find clear repro?

9

No not yet. It’s also quite inconsistent. I get it sometimes, sometimes I don’t.