When I try to launch a standalone player I get this 
Access violation - code c0000005 (first/second not available)
“”
UE4Editor_HydraPlugin_9096!FHydraPlugin::DataDelegate() [c:\unreal\secondexperimentbackup\plugins\hydraplugin\source\hydraplugin\private\fhydraplugin.cpp:854]
UE4Editor_HydraPlugin_9096!UHydraPluginComponent::InitializeComponent() [c:\unreal\secondexperimentbackup\plugins\hydraplugin\source\hydraplugin\private\hydracomponent.cpp:21]
UE4Editor_Engine!AActor::InitializeComponents() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\actor.cpp:3743]
UE4Editor_Engine!AActor::PostActorConstruction() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\actor.cpp:2599]
UE4Editor_Engine!AActor::FinishSpawning() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\actor.cpp:2578]
UE4Editor_Engine!AActor::PostSpawnInitialize() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\actor.cpp:2534]
UE4Editor_Engine!UWorld::SpawnActor() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\levelactor.cpp:430]
UE4Editor_Engine!UWorld::SpawnActor() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\levelactor.cpp:267]
UE4Editor_Engine!AGameMode::SpawnDefaultPawnFor_Implementation() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\gamemode.cpp:1272]
UE4Editor_Engine!AGameMode::execSpawnDefaultPawnFor() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\classes\gameframework\gamemode.h:67]
UE4Editor_CoreUObject!UFunction::Invoke() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\coreuobject\private\uobject\class.cpp:4195]
UE4Editor_CoreUObject!UObject::ProcessEvent() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:1046]
UE4Editor_Engine!AActor::ProcessEvent() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\actor.cpp:580]
UE4Editor_Engine!AGameMode::SpawnDefaultPawnFor() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\intermediate\build\win64\ue4editor\inc\engine\engine.generated.1.cpp:4659]
UE4Editor_Engine!AGameMode::RestartPlayer() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\gamemode.cpp:461]
UE4Editor_Engine!AGameMode::HandleMatchHasStarted() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\gamemode.cpp:589]
UE4Editor_Engine!AGameMode::SetMatchState() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\gamemode.cpp:721]
UE4Editor_Engine!AGameMode::StartMatch() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\gamemode.cpp:582]
UE4Editor_Engine!UWorld::BeginPlay() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\world.cpp:3050]
UE4Editor_Engine!UEngine::LoadMap() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\unrealengine.cpp:9667]
UE4Editor_Engine!UEngine::Browse() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\unrealengine.cpp:8742]
UE4Editor_Engine!UGameInstance::StartGameInstance() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\gameinstance.cpp:321]
UE4Editor_Engine!UGameEngine::Init() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\gameengine.cpp:503]
UE4Editor!FEngineLoop::Init() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\launch\private\launchengineloop.cpp:2095]
UE4Editor!GuardedMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\launch\private\launch.cpp:136]
UE4Editor!GuardedMainWrapper() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\launch\private\windows\launchwindows.cpp:200]