-e: see title, function continues as normal though
--no errors thrown on Windows editor

-repro:
--install osx editor with facebook support
--create new project
--switch to FB platform
--open player settings > publisher settings
--switch SDK
--NOTICE 3 errors being thrown

EndLayoutGroup: BeginLayoutGroup must be called first.
UnityEngine.DebugLogHandler:Internal_Log(LogType, String, Object)
UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
UnityEngine.Logger:Log(LogType, Object)
UnityEngine.Debug:LogError(Object)
UnityEngine.GUILayoutUtility:EndLayoutGroup() (at /Users/builduser/buildslave/unity/build/Modules/IMGUI/GUILayoutUtility.cs:332)
UnityEngine.GUILayout:EndVertical() (at /Users/builduser/buildslave/unity/build/Modules/IMGUI/GUILayout.cs:272)
UnityEditor.EditorGUILayout:EndVertical() (at /Users/builduser/buildslave/unity/build/Editor/Mono/EditorGUI.cs:8563)
UnityEditor.InspectorWindow:DrawEditor(Editor[], Int32, Boolean, Boolean&, Rect&) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Inspector/InspectorWindow.cs:1384)
UnityEditor.InspectorWindow:DrawEditors(Editor[]) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Inspector/InspectorWindow.cs:1141)
UnityEditor.InspectorWindow:OnGUI() (at /Users/builduser/buildslave/unity/build/Editor/Mono/Inspector/InspectorWindow.cs:481)
System.Reflection.MonoMethod:InternalInvoke(Object, Object[], Exception&)
System.Reflection.MonoMethod:Invoke(Object, BindingFlags, Binder, Object[], CultureInfo) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)
System.Reflection.MethodBase:Invoke(Object, Object[]) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115)
UnityEditor.HostView:Invoke(String, Object) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:295)
UnityEditor.HostView:Invoke(String) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:288)
UnityEditor.HostView:InvokeOnGUI(Rect) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:255)
UnityEditor.DockArea:OldOnGUI() (at /Users/builduser/buildslave/unity/build/Editor/Mono/GUI/DockArea.cs:390)
UnityEngine.Experimental.UIElements.IMGUIContainer:DoOnGUI(Event, Boolean) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:215)
UnityEngine.Experimental.UIElements.IMGUIContainer:HandleIMGUIEvent(Event) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:380)
UnityEngine.Experimental.UIElements.EventDispatcher:DispatchEvent(EventBase, IPanel) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/EventDispatcher.cs:370)
UnityEngine.Experimental.UIElements.UIElementsUtility:DoDispatch(BaseVisualElementPanel) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/UIElementsUtility.cs:243)
UnityEngine.Experimental.UIElements.UIElementsUtility:ProcessEvent(Int32, IntPtr) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/UIElementsUtility.cs:74)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr) (at /Users/builduser/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:171)
UnityEditor.GUIView:Internal_SendEvent(Event)
UnityEditor.GUIView:SendEvent(Event) (at /Users/builduser/buildslave/unity/build/Editor/Mono/GUIView.cs:65)
UnityEditor.PopupCallbackInfo:SetEnumValueDelegate(Object, String[], Int32) (at /Users/builduser/buildslave/unity/build/Editor/Mono/EditorGUI.cs:2815)

(Filename: /Users/builduser/buildslave/unity/build/Modules/IMGUI/GUILayoutUtility.cs Line: 332)