UE4 crash log

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Assertion failed: IsInRenderingThread() [File:/home/balthier1234/UnrealEngine/Engine/Source/Runtime/RenderCore/Private/RenderResource.cpp] [Line: 72]

libUE4Editor-Core.so!FUnixErrorOutputDevice::Serialize(char16_t const*, ELogVerbosity::Type, FName const&) [/home/balthier1234/UnrealEngine/Engine/Source/Runtime/Core/Private/Unix/UnixErrorOutputDevice.cpp:70]
libUE4Editor-Core.so!FOutputDevice::LogfImpl(char16_t const*, ...) [/home/balthier1234/UnrealEngine/Engine/Source/Runtime/Core/Private/Misc/OutputDevice.cpp:71]
libUE4Editor-Core.so!FDebug::AssertFailed(char const*, char const*, int, char16_t const*, ...) [/home/balthier1234/UnrealEngine/Engine/Source/Runtime/Core/Private/Misc/AssertionMacros.cpp:440]
libUE4Editor-Core.so!FDebug::CheckVerifyFailedImpl(char const*, char const*, int, char16_t const*, ...) [/home/balthier1234/UnrealEngine/Engine/Source/Runtime/Core/Private/Misc/AssertionMacros.cpp:416]
libUE4Editor-RenderCore.so!FRenderResource::ReleaseResource() [/home/balthier1234/UnrealEngine/Engine/Source/Runtime/RenderCore/Private/RenderResource.cpp:72]
libUE4Editor-WebMMedia.so!TGlobalResource<(anonymous namespace)::FMoviePlaybackResources>::~TGlobalResource() [/home/balthier1234/UnrealEngine/Engine/Source/Runtime/RenderCore/Public/RenderResource.h:189]
libc.so.6!UnknownFunction(0x3c9ab)
libc.so.6!exit(+0x19)
libX11.so.6!_XDefaultError(+0x36)
libX11.so.6!_XError(+0x119)
libX11.so.6!UnknownFunction(0x43076)
libX11.so.6!UnknownFunction(0x4311c)
libX11.so.6!_XReply(+0x22f)
libX11.so.6!XGetWindowProperty(+0x104)
libUE4Editor-ApplicationCore.so!X11_DispatchEvent [/home/bschaefer/UnrealEngine/Engine/Source/ThirdParty/SDL2/SDL-gui-backend/src/video/x11/SDL_x11events.c:1468]
libUE4Editor-ApplicationCore.so!X11_PumpEvents [/home/bschaefer/UnrealEngine/Engine/Source/ThirdParty/SDL2/SDL-gui-backend/src/video/x11/SDL_x11events.c:1611]
libUE4Editor-ApplicationCore.so!SDL_PollEvent_REAL [/home/bschaefer/UnrealEngine/Engine/Source/ThirdParty/SDL2/SDL-gui-backend/src/events/SDL_events.c:668]
libUE4Editor-ApplicationCore.so!FLinuxPlatformApplicationMisc::PumpMessages(bool) [/home/balthier1234/UnrealEngine/Engine/Source/Runtime/ApplicationCore/Private/Linux/LinuxPlatformApplicationMisc.cpp:413]
UE4Editor!FEngineLoop::Tick() [/home/balthier1234/UnrealEngine/Engine/Source/Runtime/Launch/Private/LaunchEngineLoop.cpp:3882]
UE4Editor!GuardedMain(char16_t const*) [/home/balthier1234/UnrealEngine/Engine/Source/Runtime/Launch/Private/Launch.cpp:170]
libUE4Editor-UnixCommonStartup.so!CommonUnixMain(int, char**, int (*)(char16_t const*)) [/home/balthier1234/UnrealEngine/Engine/Source/Runtime/Unix/UnixCommonStartup/Private/UnixCommonStartup.cpp:243]
libc.so.6!__libc_start_main(+0xea)
UE4Editor!_start()