Happens a lot in a new 2020.3.0f1 LTS. ================================================================= Got a SIGSEGV while executing native code. This usually indicates a fatal error in the mono runtime or one of the native libraries used by your application. ================================================================= Received signal SIGSEGV Stack trace: 0x00007ff7be5f85b1 (Unity) Transform::MoveAfterSiblingInternal 0x00007ff7bf51b039 (Unity) HandleSetTransformFatherDragAndDrop 0x00007ff7bf513a67 (Unity) DragAndDropForwarding::ForwardDragAndDrop 0x00007ff7bf542d6b (Unity) InternalEditorUtilityBindings::HierarchyWindowDragByID 0x00007ff7c073137e (Unity) InternalEditorUtility_CUSTOM_HierarchyWindowDragByID 0x000001c4a624bfcb (Mono JIT Code) (wrapper managed-to-native) UnityEditorInternal.InternalEditorUtility:HierarchyWindowDragByID (int,UnityEditorInternal.InternalEditorUtility/HierarchyDropMode,UnityEngine.Transform,bool) 0x000001c4a624c465 (Mono JIT Code) (wrapper runtime-invoke) <Module>:runtime_invoke_DragAndDropVisualMode_int_int_object_byte (object,intptr,intptr,intptr) 0x00007ffd222de480 (mono-2.0-bdwgc) [mini-runtime.c:2812] mono_jit_runtime_invoke 0x00007ffd22262902 (mono-2.0-bdwgc) [object.c:2921] do_runtime_invoke 0x00007ffd2226bb32 (mono-2.0-bdwgc) [object.c:3073] mono_runtime_invoke_checked 0x00007ffd2226c2c9 (mono-2.0-bdwgc) [object.c:5264] mono_runtime_try_invoke_array 0x00007ffd2226bac6 (mono-2.0-bdwgc) [object.c:5142] mono_runtime_invoke_array_checked 0x00007ffd222103a4 (mono-2.0-bdwgc) [icall.c:3358] ves_icall_InternalInvoke 0x000001c42d1fced6 (Mono JIT Code) (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&) 0x000001c42d1fc5bb (Mono JIT Code) System.Reflection.MonoMethod:Invoke (object,System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo) 0x000001c42b164d5f (Mono JIT Code) System.Reflection.MethodBase:Invoke (object,object[]) 0x000001c4bf3ac9b3 (Mono JIT Code) System.DelegateynamicInvokeImpl (object[]) 0x000001c4bf3ac07b (Mono JIT Code) System.MulticastDelegateynamicInvokeImpl (object[]) 0x000001c4bf3abf55 (Mono JIT Code) System.DelegateynamicInvoke (object[]) 0x000001c4bf3abb13 (Mono JIT Code) UnityEditor.DragAndDropServicerop (int,object[]) 0x000001c4bf3b1763 (Mono JIT Code) UnityEditor.GameObjectsTreeViewDraggingoDrag (UnityEditor.IMGUI.Controls.TreeViewItem,UnityEditor.IMGUI.Controls.TreeViewItem,bool,UnityEditor.IMGUI.Controls.TreeViewDragging/DropPosition) 0x000001c4bf3a47ce (Mono JIT Code) UnityEditor.IMGUI.Controls.TreeViewDraggingragElement (UnityEditor.IMGUI.Controls.TreeViewItem,UnityEngine.Rect,int) 0x000001c4a2d7967d (Mono JIT Code) UnityEditor.IMGUI.Controls.TreeViewController:HandleUnusedMouseEventsForItem (UnityEngine.Rect,UnityEditor.IMGUI.Controls.TreeViewItem,int) 0x000001c4a0bb39ab (Mono JIT Code) UnityEditor.IMGUI.Controls.TreeViewControlleroItemGUI (UnityEditor.IMGUI.Controls.TreeViewItem,int,single,bool) 0x000001c4a0bb1f23 (Mono JIT Code) UnityEditor.IMGUI.Controls.TreeViewController:IterateVisibleItems (int,int,single,bool) 0x000001c4a0ba8d9b (Mono JIT Code) UnityEditor.IMGUI.Controls.TreeViewController:OnGUI (UnityEngine.Rect,int) 0x000001c4a0ba4d8b (Mono JIT Code) UnityEditor.SceneHierarchyoTreeView (single) 0x000001c4a0ba1b0b (Mono JIT Code) UnityEditor.SceneHierarchy:OnGUI (UnityEngine.Rect) 0x000001c4a0ba178b (Mono JIT Code) UnityEditor.SceneHierarchyWindowoSceneHierarchy () 0x000001c4d0cd1c8b (Mono JIT Code) UnityEditor.SceneHierarchyWindow:OnGUI () 0x000001c4a0a71934 (Mono JIT Code) UnityEditor.HostView:InvokeOnGUI (UnityEngine.Rect,UnityEngine.Rect) 0x000001c4a0a712c3 (Mono JIT Code) UnityEditor.DockArearawView (UnityEngine.Rect,UnityEngine.Rect) 0x000001c4a0a5700b (Mono JIT Code) UnityEditor.DockArea:OldOnGUI () 0x000001c4a0a21eca (Mono JIT Code) UnityEngine.UIElements.IMGUIContaineroOnGUI (UnityEngine.Event,UnityEngine.Matrix4x4,UnityEngine.Rect,bool,UnityEngine.Rect,System.Action,bool) 0x000001c4a0a1f6a3 (Mono JIT Code) UnityEngine.UIElements.IMGUIContainer:HandleIMGUIEvent (UnityEngine.Event,UnityEngine.Matrix4x4,UnityEngine.Rect,System.Action,bool) 0x000001c4a2df33db (Mono JIT Code) UnityEngine.UIElements.IMGUIContainer:HandleIMGUIEvent (UnityEngine.Event,System.Action,bool) 0x000001c4a2df30c3 (Mono JIT Code) UnityEngine.UIElements.IMGUIContainer:HandleIMGUIEvent (UnityEngine.Event,bool) 0x000001c4a3f5182b (Mono JIT Code) UnityEngine.UIElements.IMGUIContainer:SendEventToIMGUIRaw (UnityEngine.UIElements.EventBase,bool,bool) 0x000001c4a3f497f3 (Mono JIT Code) UnityEngine.UIElements.IMGUIContainer:SendEventToIMGUI (UnityEngine.UIElements.EventBase,bool,bool) 0x000001c4393c6e9b (Mono JIT Code) UnityEngine.UIElements.IMGUIContainer:HandleEvent (UnityEngine.UIElements.EventBase) 0x000001c43939698a (Mono JIT Code) UnityEngine.UIElements.EventDispatchUtilitiesropagateEvent (UnityEngine.UIElements.EventBase) 0x000001c4a3f50b23 (Mono JIT Code) UnityEngine.UIElements.MouseEventDispatchingStrategy:SendEventToRegularTarget (UnityEngine.UIElements.EventBase,UnityEngine.UIElements.BaseVisualElementPanel) 0x000001c4a3f5085b (Mono JIT Code) UnityEngine.UIElements.MouseEventDispatchingStrategy:SendEventToTarget (UnityEngine.UIElements.EventBase,UnityEngine.UIElements.BaseVisualElementPanel) 0x000001c4a3f4f66b (Mono JIT Code) UnityEngine.UIElements.MouseEventDispatchingStrategyispatchEvent (UnityEngine.UIElements.EventBase,UnityEngine.UIElements.IPanel) 0x000001c439393796 (Mono JIT Code) UnityEngine.UIElements.EventDispatcher:ApplyDispatchingStrategies (UnityEngine.UIElements.EventBase,UnityEngine.UIElements.IPanel,bool) 0x000001c439392383 (Mono JIT Code) UnityEngine.UIElements.EventDispatcherrocessEvent (UnityEngine.UIElements.EventBase,UnityEngine.UIElements.IPanel) 0x000001c4393915f3 (Mono JIT Code) UnityEngine.UIElements.EventDispatcherispatch (UnityEngine.UIElements.EventBase,UnityEngine.UIElements.IPanel,UnityEngine.UIElements.DispatchMode) 0x000001c43939115b (Mono JIT Code) UnityEngine.UIElements.BaseVisualElementPanel:SendEvent (UnityEngine.UIElements.EventBase,UnityEngine.UIElements.DispatchMode) 0x000001c4a098e213 (Mono JIT Code) UnityEngine.UIElements.UIElementsUtilityoDispatch (UnityEngine.UIElements.BaseVisualElementPanel) 0x000001c4a098d423 (Mono JIT Code) UnityEngine.UIElements.UIElementsUtility:UnityEngine.UIElements.IUIElementsUtility.ProcessEvent (int,intptr,bool&) 0x000001c4a098ce3f (Mono JIT Code) UnityEngine.UIElements.UIEventRegistrationrocessEvent (int,intptr) 0x000001c4a098cb2b (Mono JIT Code) UnityEngine.UIElements.UIEventRegistration/<>c:<.cctor>b__1_2 (int,intptr) 0x000001c4a098c645 (Mono JIT Code) UnityEngine.GUIUtilityrocessEvent (int,intptr,bool&) 0x000001c4a098c866 (Mono JIT Code) (wrapper runtime-invoke) <Module>:runtime_invoke_void_int_intptr_intptr& (object,intptr,intptr,intptr) 0x00007ffd222de480 (mono-2.0-bdwgc) [mini-runtime.c:2812] mono_jit_runtime_invoke 0x00007ffd22262902 (mono-2.0-bdwgc) [object.c:2921] do_runtime_invoke 0x00007ffd2226b95f (mono-2.0-bdwgc) [object.c:2968] mono_runtime_invoke 0x00007ff7bea312a4 (Unity) scripting_method_invoke 0x00007ff7bea29c25 (Unity) ScriptingInvocation::Invoke 0x00007ff7bea22b25 (Unity) ScriptingInvocation::Invoke<void> 0x00007ff7bd0f1b3d (Unity) Scripting::UnityEngine::GUIUtilityProxy:rocessEvent 0x00007ff7bf64b366 (Unity) GUIView:rocessRetainedMode 0x00007ff7c00ceb1e (Unity) GUIView::OnInputEvent 0x00007ff7bf64b258 (Unity) GUIView:rocessInputEvent 0x00007ff7c00c59d6 (Unity) GUIView:ragEvent 0x00007ff7c00bd60c (Unity) WindowsDropTargetImpl:ragPerformed 0x00007ff7c00a5edf (Unity) CDropTarget:rop 0x00007ffd9be9bae8 (ole32) RevokeActiveObjectExt 0x00007ffd9be9b98c (ole32) RevokeActiveObjectExt 0x00007ffd9be59179 (ole32) OleGetPackageClipboardOwner 0x00007ffd9be58865 (ole32) OleGetPackageClipboardOwner 0x00007ffd9be5c938 (ole32) DoDragDrop 0x00007ff7c00bf516 (Unity) DragAndDrop::StartDelayedDrag 0x00007ff7c00bd818 (Unity) DragAndDrop::ApplyQueuedStartDrag 0x00007ff7c00cedc4 (Unity) GUIView::OnInputEvent 0x00007ff7bf64b0a0 (Unity) GUIView:rocessInputEvent 0x00007ff7c00d0005 (Unity) GUIView:rocessEventMessages 0x00007ff7c00c7550 (Unity) GUIView::GUIViewWndProc 0x00007ffd9caae858 (USER32) CallWindowProcW 0x00007ffd9caae299 (USER32) DispatchMessageW 0x00007ff7c0096533 (Unity) MainMessageLoop 0x00007ff7c009a641 (Unity) WinMain 0x00007ff7c1f0f436 (Unity) __scrt_common_main_seh 0x00007ffd9c987034 (KERNEL32) BaseThreadInitThunk 0x00007ffd9d102651 (ntdll) RtlUserThreadStart