UE5 crashes when removing a Blueprint w/ JSBSim component from the world

[ugenethehobo]

Pretty much the title. I have a level where I dragged in a plane blueprint that uses the JSBSim component. I no longer want it in the level, so I go to delete it and the editor instantly crashes every time.

[gallonmate]

How recently did you download the UE5 JSBSim plugin? There was a fix added to the github repo the other week. #1212

[ugenethehobo]

I did not see that, thank you!

EDIT: Upon testing, UE5.4 still crashes when I attempt to delete an actor with the JSBSim component.

[ugenethehobo]

Log output:

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000000000000ac

UnrealEditor_JSBSimFlightDynamicsModelEditor!FJSBSimMovementCompVisualizer::DrawVisualization() [C:\Users\ugene\Documents\Unreal Projects\Learnin_To_Fly\Plugins\JSBSimFlightDynamicsModel\Source\JSBSimFlightDynamicsModelEditor\Private\JSBSimMovementCompVisualizer.cpp:55]
UnrealEditor_UnrealEd!UUnrealEdEngine::DrawComponentVisualizers() [D:\build++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\UnrealEdEngine.cpp:1510]
UnrealEditor_UnrealEd!FLevelEditorViewportClient::Draw() [D:\build++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\LevelEditorViewport.cpp:4975]
UnrealEditor_Renderer!FSceneRenderer::FSceneRenderer() [D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\SceneRendering.cpp:2641]
UnrealEditor_Renderer!FDeferredShadingSceneRenderer::FDeferredShadingSceneRenderer() [D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\DeferredShadingRenderer.cpp:383]
UnrealEditor_Renderer!FSceneRenderer::CreateSceneRenderers() [D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\SceneRendering.cpp:4298]
UnrealEditor_Renderer!FRendererModule::BeginRenderingViewFamilies() [D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\SceneRendering.cpp:5089]
UnrealEditor_Renderer!FRendererModule::BeginRenderingViewFamily() [D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\SceneRendering.cpp:4968]
UnrealEditor_UnrealEd!FEditorViewportClient::Draw() [D:\build++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\EditorViewportClient.cpp:4294]
UnrealEditor_Engine!FViewport::Draw() [D:\build++UE5\Sync\Engine\Source\Runtime\Engine\Private\UnrealClient.cpp:1754]
UnrealEditor_UnrealEd!UEditorEngine::UpdateSingleViewportClient() [D:\build++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\EditorEngine.cpp:2537]
UnrealEditor_UnrealEd!UEditorEngine::Tick() [D:\build++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\EditorEngine.cpp:2190]
UnrealEditor_UnrealEd!UUnrealEdEngine::Tick() [D:\build++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\UnrealEdEngine.cpp:550]
UnrealEditor!FEngineLoop::Tick() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:5921]
UnrealEditor!GuardedMain() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:180]
UnrealEditor!GuardedMainWrapper() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:118]
UnrealEditor!LaunchWindowsStartup() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:258]
UnrealEditor!WinMain() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:298]
UnrealEditor!__scrt_common_main_seh() [D:\a_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll

[gallonmate]

That error suggests that the project did not get the updated fix. Did you rebuild the plugin in visual studio after updating the files?
Was the fix successfully added to your project files?
You can check the JSBSimMovementCompVisualizer.cpp file found in your folder, C:\Users\ugene\Documents\Unreal Projects\Learnin_To_Fly\Plugins\JSBSimFlightDynamicsModel\Source\JSBSimFlightDynamicsModelEditor\Private

Scroll down to line 55. If you do not see the following code, then your plugin did not get the updated code:

jsbsim/UnrealEngine/Plugins/JSBSimFlightDynamicsModel/Source/JSBSimFlightDynamicsModelEditor/Private/JSBSimMovementCompVisualizer.cpp

Lines 55 to 58 in 70505e6

	if (!MovementComponent)
	{
	return;
	}

And the same code should appear at line 109:

jsbsim/UnrealEngine/Plugins/JSBSimFlightDynamicsModel/Source/JSBSimFlightDynamicsModelEditor/Private/JSBSimMovementCompVisualizer.cpp

Lines 109 to 112 in 70505e6

	if (!MovementComponent)
	{
	return;
	}

If you do see this code, then the plugin did not get rebuilt successfully with the changes.

[SLGY]

I've been experiencing this identical issue ever since I started using JSBSim and UE-5.5 last November. My workaround for it has been to have my aircraft Blueprint called during runtime (by the level's GameMode) instead of having it as an actor already in the level, that way I don't have to ever delete it from the level to change aircraft, etc, I just select a different blueprint in GameMode to be the player pawn. This is a workaround though obviously, not a solution. I'll re-check it soon with the updated plugin and see if it's fixed.