Description

When spawning an actor using the Spawn Actor From Class node that has a Set Replicates node in the construction script, the editor crashes upon attempting to run a dedicated server with 2 players.

Found in 4.10.4. Reproduced in 4.11 Preview 6 and Main CL 2884405.

Crash Reporter Bugg: [Link Removed]

Source Context:

 2830       if (RemoteRole != ROLE_None)
 2831       {
 2832       GetWorld()->AddNetworkActor(this);
 2833       }
 2834       }
 2835       
 2836       void AActor::PostNetInit()
 2837       {
 2838       if(RemoteRole != ROLE_Authority)
 2839       {
 2840       UE_LOG(LogActor, Warning, TEXT("AActor::PostNetInit %s Remoterole: %d"), *GetName(), (int)RemoteRole);
 2841       }
 2842       check(RemoteRole == ROLE_Authority);
 2843       
 2844 ***** if (!HasActorBegunPlay())
 2845       {
 2846       const UWorld* MyWorld = GetWorld();
 2847       if (MyWorld && MyWorld->HasBegunPlay())
 2848       {
 2849       SCOPE_CYCLE_COUNTER(STAT_ActorBeginPlay);
 2850       BeginPlay();
 2851       }
 2852       }
 2853       
 2854       UpdateOverlaps();
 2855       }
 2856       
 2857       void AActor::ExchangeNetRoles(bool bRemoteOwned)
 2858       {
 2859       checkf(!HasAnyFlags(RF_ClassDefaultObject), TEXT("ExchangeNetRoles should never be called on a CDO as it causes issues when replicating actors over the network due to mutated transient data!"));
Steps to Reproduce

1. Open the editor
2. Create a new actor blueprint
3. Give the blueprint a boolean variable that is public and expose on spawn.
4. In the construction script, put a Set Replicates node and connect your boolean variable to the In Replicates pin. (See Screenshot)
5. Compile & Save
6. In the level blueprint, place a Switch Has Authority->Spawn Actor From Class (Spawn the actor you created in step 2). Ensure to set your boolean variable to true on the Spawn Actor From Class node. (See Screenshot)
7. Compile
8. Hit the arrow next to the Play button and set number of players to 2
9. Set Run Dedicated Server to true.
10. Press Play

Result: Editor Crashes

Expected: No crash would occur.

Callstack

Assertion failed: RemoteRole == ROLE_Authority [Link Removed] [Line: 2789]

UE4Editor_Core!FDebug::AssertFailed() [d:\sean.flint_z5610_streammain\engine\source\runtime\core\private\misc\outputdevice.cpp:430]
UE4Editor_Engine!AActor::PostNetInit() [d:\sean.flint_z5610_streammain\engine\source\runtime\engine\private\actor.cpp:2791]
UE4Editor_Engine!UActorChannel::ProcessBunch() [d:\sean.flint_z5610_streammain\engine\source\runtime\engine\private\datachannel.cpp:2106]
UE4Editor_Engine!UActorChannel::ReceivedBunch() [d:\sean.flint_z5610_streammain\engine\source\runtime\engine\private\datachannel.cpp:1955]
UE4Editor_Engine!UChannel::ReceivedSequencedBunch() [d:\sean.flint_z5610_streammain\engine\source\runtime\engine\private\datachannel.cpp:273]
UE4Editor_Engine!UChannel::ReceivedNextBunch() [d:\sean.flint_z5610_streammain\engine\source\runtime\engine\private\datachannel.cpp:626]
UE4Editor_Engine!UChannel::ReceivedRawBunch() [d:\sean.flint_z5610_streammain\engine\source\runtime\engine\private\datachannel.cpp:357]
UE4Editor_Engine!UNetConnection::ReceivedPacket() [d:\sean.flint_z5610_streammain\engine\source\runtime\engine\private\netconnection.cpp:1078]
UE4Editor_Engine!UNetConnection::ReceivedRawPacket() [d:\sean.flint_z5610_streammain\engine\source\runtime\engine\private\netconnection.cpp:533]
UE4Editor_OnlineSubsystemUtils!UIpNetDriver::TickDispatch() [d:\sean.flint_z5610_streammain\engine\source\runtime\online\onlinesubsystemutils\private\ipnetdriver.cpp:197]
UE4Editor_Engine!TBaseUObjectMethodDelegateInstance<0,UNetDriver,void __cdecl(float)>::ExecuteIfSafe() [d:\sean.flint_z5610_streammain\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:852]
UE4Editor_Engine!TBaseMulticastDelegate<void,float>::Broadcast() [d:\sean.flint_z5610_streammain\engine\source\runtime\core\public\delegates\delegatesignatureimpl_variadics.inl:921]
UE4Editor_Engine!UWorld::Tick() [d:\sean.flint_z5610_streammain\engine\source\runtime\engine\private\leveltick.cpp:1105]
UE4Editor_UnrealEd!UEditorEngine::Tick() [d:\sean.flint_z5610_streammain\engine\source\editor\unrealed\private\editorengine.cpp:1354]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [d:\sean.flint_z5610_streammain\engine\source\editor\unrealed\private\unrealedengine.cpp:370]
UE4Editor!FEngineLoop::Tick() [d:\sean.flint_z5610_streammain\engine\source\runtime\launch\private\launchengineloop.cpp:2657]
UE4Editor!GuardedMain() [d:\sean.flint_z5610_streammain\engine\source\runtime\launch\private\launch.cpp:142]
UE4Editor!GuardedMainWrapper() [d:\sean.flint_z5610_streammain\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\sean.flint_z5610_streammain\engine\source\runtime\launch\private\windows\launchwindows.cpp:200]

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Fixed
ComponentUE - Networking
Affects Versions4.104.114.12
Target Fix4.11.2
Fix Commit2944660
Release Commit2944660
CreatedMar 1, 2016
ResolvedApr 14, 2016
UpdatedNov 22, 2016
View Jira Issue