# Assertion failed PlayWorld==NULL when launching a networked game

**URL:** <https://forums.unrealengine.com/t/assertion-failed-playworld-null-when-launching-a-networked-game/366845>\
**Category:** Multiplayer & Networking\
**Tags:** Networking, unreal-engine, Multiplayer, question\
**Created:** [August 11, 2016, 3:07pm UTC](https://forums.unrealengine.com/t/assertion-failed-playworld-null-when-launching-a-networked-game/366845 "2016-08-11T15:07:09Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![anonymous\_user\_79019dad](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_79019dad](https://forums.unrealengine.com/u/anonymous_user_79019dad)\
**Post date:** [August 11, 2016, 3:07pm UTC](https://forums.unrealengine.com/t/assertion-failed-playworld-null-when-launching-a-networked-game/366845/1 "2016-08-11T15:07:09Z")

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I’m trying to launch my game with 2 players, 1 as a listen server which runs from the editor, and another standalone player which is spun up separately from the editor. This always asserts during the creation of the standalone instance of the game.

Callstack is here:

Assertion failed: PlayWorld == NULL [File:D:\BuildFarm\buildmachine\_++UE4+Release-4.11\Engine\Source\Editor\UnrealEd\Private\EditorEngine.cpp] [Line: 861]

UE4Editor\_Core!FDebug::AssertFailed() [d:\buildfarm\buildmachine\_++ue4+release-4.11\engine\source\runtime\core\private\misc\outputdevice.cpp:430]  
UE4Editor\_UnrealEd!UEditorEngine::FinishDestroy() [d:\buildfarm\buildmachine\_++ue4+release-4.11\engine\source\editor\unrealed\private\editorengine.cpp:864]  
UE4Editor\_CoreUObject!UObject::ConditionalFinishDestroy() [d:\buildfarm\buildmachine\_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\obj.cpp:688]  
UE4Editor\_CoreUObject!IncrementalPurgeGarbage() [d:\buildfarm\buildmachine\_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\garbagecollection.cpp:906]  
UE4Editor\_CoreUObject!StaticExit() [d:\buildfarm\buildmachine\_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\obj.cpp:3738]  
UE4Editor\_CoreUObject!TBaseStaticDelegateInstance::ExecuteIfSafe() [d:\buildfarm\buildmachine\_++ue4+release-4.11\engine\source\runtime\core\public\delegates\delegateinstancesimpl\_variadics.inl:1021]  
UE4Editor!TBaseMulticastDelegate::Broadcast() [d:\buildfarm\buildmachine\_++ue4+release-4.11\engine\source\runtime\core\public\delegates\delegatesignatureimpl\_variadics.inl:921]  
UE4Editor!FEngineLoop::AppPreExit() [d:\buildfarm\buildmachine\_++ue4+release-4.11\engine\source\runtime\launch\private\launchengineloop.cpp:3200]  
UE4Editor!FEngineLoop::Exit() [d:\buildfarm\buildmachine\_++ue4+release-4.11\engine\source\runtime\launch\private\launchengineloop.cpp:2298]  
UE4Editor!GuardedMain() [d:\buildfarm\buildmachine\_++ue4+release-4.11\engine\source\runtime\launch\private\launch.cpp:153]  
UE4Editor!GuardedMainWrapper() [d:\buildfarm\buildmachine\_++ue4+release-4.11\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]  
UE4Editor!WinMain() [d:\buildfarm\buildmachine\_++ue4+release-4.11\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

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<div class="post-metadata">

**Author:** ![Sean\_Flint](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Sean\_Flint](https://forums.unrealengine.com/u/Sean_Flint)\
**Post date:** [August 11, 2016, 3:30pm UTC](https://forums.unrealengine.com/t/assertion-failed-playworld-null-when-launching-a-networked-game/366845/2 "2016-08-11T15:30:35Z")

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Hello,

This is a known issue with 4.11 that was resolved in 4.12. Here is the link to the issue: [Unreal Engine Issues and Bug Tracker (UE-28826)](https://issues.unrealengine.com/issue/UE-28826)

Have a great day!

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<div class="post-metadata">

**Author:** ![anonymous\_user\_79019dad](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_79019dad](https://forums.unrealengine.com/u/anonymous_user_79019dad)\
**Post date:** [August 11, 2016, 3:32pm UTC](https://forums.unrealengine.com/t/assertion-failed-playworld-null-when-launching-a-networked-game/366845/3 "2016-08-11T15:32:05Z")

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Ah ok, great, thanks