Strange error messages appear on bake

Anyone else see these error messages when they bake? All I have are a few objects in the scene that I'm baking. I don't even have any GUI elements or scripts trying to control GUI elements so I'm rather confused as to why I would be getting GUI related errors.

ArgumentException: Getting control 1's position in a group with only 1 controls when doing Repaint
Aborting
UnityEngine.GUILayoutGroup.GetNext () (at C:/buildslave/unity/build/artifacts/generated/common/runtime/GUILayoutUtility.gen.cs:511)
UnityEngine.GUILayoutUtility.BeginLayoutGroup (UnityEngine.GUIStyle style, UnityEngine.GUILayoutOption[] options, System.Type LayoutType) (at C:/buildslave/unity/build/artifacts/generated/common/runtime/GUILayoutUtility.gen.cs:208)
UnityEditor.EditorGUILayout.BeginHorizontal (UnityEngine.GUIContent content, UnityEngine.GUIStyle style, UnityEngine.GUILayoutOption[] options) (at C:/buildslave/unity/build/Editor/Mono/EditorGUI.cs:6352)
UnityEditor.EditorGUILayout.BeginHorizontal (UnityEngine.GUILayoutOption[] options) (at C:/buildslave/unity/build/Editor/Mono/EditorGUI.cs:6331)
UnityEditor.SceneHierarchyWindow.DoSearchResultPathGUI () (at C:/buildslave/unity/build/Editor/Mono/SceneHierarchyWindow.cs:306)
UnityEditor.SceneHierarchyWindow.OnGUI () (at C:/buildslave/unity/build/Editor/Mono/SceneHierarchyWindow.cs:179)
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)

 

Yup, I've seen this error popup in the console log occasionally.