'EditorGUILayout.ColorField is ambiguous error on import

[baroquedub]

Unity 2019.4.15 getting the following error on import:

The call is ambiguous between the following methods or properties: 'EditorGUILayout.ColorField(GUIContent, Color, bool, bool, bool, ColorPickerHDRConfig, params GUILayoutOption[])' and 'EditorGUILayout.ColorField(GUIContent, Color, bool, bool, bool, params GUILayoutOption[])'

Fixed, I think? by making an explicit reference to what type 'null' is.

VertexPainterWindow_GUI.cs line 464:
orig:
brushColor = EditorGUILayout.ColorField(new GUIContent("Brush Color"), brushColor, true, showAlpha, false, null);

change to:
GUILayoutOption[] options = null; brushColor = EditorGUILayout.ColorField(new GUIContent("Brush Color"), brushColor, true, showAlpha, false, options);