Crash on `/getProdStats`

[saffronjam]

Hi!

Similar to the issue https://github.com/porisius/FicsitRemoteMonitoring/issues/80, I am getting a crash when accessing a route. For me the game crashes on /getProdStats.

Here is the stack trace:

Version: 368883, IsEditor: No, IsPerforceBuild: No, BuildConfiguration: Shipping, Launcher: Steam, NetMode: Listen Server, IsUsingMods: Yes, IsSaveGameEdited: No

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000000000000000

FactoryGameSteam_FicsitRemoteMonitoring_Win64_Shipping!UFRM_Production::getProdStats() [A:\workspace\SatisfactoryModLoader\Mods\FicsitRemoteMonitoring\Source\FicsitRemoteMonitoring\Private\FRM_Production.cpp:68]
FactoryGameSteam_FicsitRemoteMonitoring_Win64_Shipping!AFicsitRemoteMonitoring::execgetProdStats() [A:\workspace\SatisfactoryModLoader\Mods\FicsitRemoteMonitoring\Intermediate\Build\Win64\FactoryGameSteam\Inc\FicsitRemoteMonitoring\UHT\FicsitRemoteMonitoring.gen.cpp:396]
FactoryGameSteam_CoreUObject_Win64_Shipping!UFunction::Invoke() [C:\BuildAgent\work\b731a33f2a691e17\UE4\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:6666]
FactoryGameSteam_CoreUObject_Win64_Shipping!UObject::ProcessEvent() [C:\BuildAgent\work\b731a33f2a691e17\UE4\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:2161]
FactoryGameSteam_Engine_Win64_Shipping!AActor::ProcessEvent() [C:\BuildAgent\work\b731a33f2a691e17\UE4\Engine\Source\Runtime\Engine\Private\Actor.cpp:1175]
FactoryGameSteam_FicsitRemoteMonitoring_Win64_Shipping!AFicsitRemoteMonitoring::CallEndpoint() [A:\workspace\SatisfactoryModLoader\Mods\FicsitRemoteMonitoring\Source\FicsitRemoteMonitoring\Private\FicsitRemoteMonitoring.cpp:583]
FactoryGameSteam_FicsitRemoteMonitoring_Win64_Shipping!AFicsitRemoteMonitoring::HandleEndpoint() [A:\workspace\SatisfactoryModLoader\Mods\FicsitRemoteMonitoring\Source\FicsitRemoteMonitoring\Private\FicsitRemoteMonitoring.cpp:596]
FactoryGameSteam_FicsitRemoteMonitoring_Win64_Shipping!AFicsitRemoteMonitoring::HandleApiRequest() [A:\workspace\SatisfactoryModLoader\Mods\FicsitRemoteMonitoring\Source\FicsitRemoteMonitoring\Private\FicsitRemoteMonitoring.cpp:362]
FactoryGameSteam_FicsitRemoteMonitoring_Win64_Shipping!``AFicsitRemoteMonitoring::StartWebSocketServer'::`2'::<lambda_1>::operator()'::`3'::<lambda_8>::operator()<uWS::HttpResponse<0>,uWS::HttpRequest>() [A:\workspace\SatisfactoryModLoader\Mods\FicsitRemoteMonitoring\Source\FicsitRemoteMonitoring\Private\FicsitRemoteMonitoring.cpp:195]
FactoryGameSteam_FicsitRemoteMonitoring_Win64_Shipping!ofats::any_detail::handler_traits<bool,uWS::HttpRouter<uWS::HttpContextData<0>::RouterData> *>::large_handler<`uWS::HttpContext<0>::onHttp'::`2'::<lambda_1> >::call() [A:\workspace\SatisfactoryModLoader\Mods\FicsitRemoteMonitoring\Source\ThirdParty\uWebSockets\MoveOnlyFunction.h:152]
FactoryGameSteam_FicsitRemoteMonitoring_Win64_Shipping!uWS::HttpRouter<uWS::HttpContextData<0>::RouterData>::executeHandlers() [A:\workspace\SatisfactoryModLoader\Mods\FicsitRemoteMonitoring\Source\ThirdParty\uWebSockets\HttpRouter.h:188]
FactoryGameSteam_FicsitRemoteMonitoring_Win64_Shipping!``uWS::HttpContext<0>::init'::`2'::<lambda_3>::operator()'::`2'::<lambda_1>::operator()() [A:\workspace\SatisfactoryModLoader\Mods\FicsitRemoteMonitoring\Source\ThirdParty\uWebSockets\HttpContext.h:177]
FactoryGameSteam_FicsitRemoteMonitoring_Win64_Shipping!uWS::HttpParser::fenceAndConsumePostPadded<0>() [A:\workspace\SatisfactoryModLoader\Mods\FicsitRemoteMonitoring\Source\ThirdParty\uWebSockets\HttpParser.h:514]
FactoryGameSteam_FicsitRemoteMonitoring_Win64_Shipping!uWS::HttpParser::consumePostPadded() [A:\workspace\SatisfactoryModLoader\Mods\FicsitRemoteMonitoring\Source\ThirdParty\uWebSockets\HttpParser.h:698]
FactoryGameSteam_FicsitRemoteMonitoring_Win64_Shipping!`uWS::HttpContext<0>::init'::`2'::<lambda_3>::operator()() [A:\workspace\SatisfactoryModLoader\Mods\FicsitRemoteMonitoring\Source\ThirdParty\uWebSockets\HttpContext.h:143]
FactoryGameSteam_FicsitRemoteMonitoring_Win64_Shipping!us_internal_dispatch_ready_poll() [A:\workspace\vcpkg\buildtrees\usockets\src\v0.8.8-af4482ba56.clean\src\loop.c:358]
uv
uv
FactoryGameSteam_FicsitRemoteMonitoring_Win64_Shipping!`AFicsitRemoteMonitoring::StartWebSocketServer'::`2'::<lambda_1>::operator()() [A:\workspace\SatisfactoryModLoader\Mods\FicsitRemoteMonitoring\Source\FicsitRemoteMonitoring\Private\FicsitRemoteMonitoring.cpp:213]
FactoryGameSteam_FicsitRemoteMonitoring_Win64_Shipping!TAsyncRunnable<void>::Run() [A:\Unreal Engine - CSS\Engine\Source\Runtime\Core\Public\Async\Async.h:457]
FactoryGameSteam_Core_Win64_Shipping!FRunnableThreadWin::Run() [C:\BuildAgent\work\b731a33f2a691e17\UE4\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:149]

Looking through the code, it seems that an "ResourceClass" might be NULL:

TScriptInterface<IFGExtractableResourceInterface> ResourceClass = Extractor->GetExtractableResource();
TSubclassOf<UFGResourceDescriptor> ItemClass = ResourceClass->GetResourceClass();

The save was created prior to 1.0, so could this be a regression due to that?

Let me know if a simple "if null then continue" check should be sufficient and I can open a PR for it.