EndLayoutGroup Error appears on Console while closing a window which asks for a path to save preset for any GameObject.

Steps to Reproduce:
1. Open Unity Project
2. Select any GameObject from Hierarchy
3. Select "Preset" icon from any component of GameObject
4. Select "Save current to..." from Select Preset Tab
5. A popup will appear asking for Saving Preset, Select "Cancel"
6. Observe error on Console.

Working with:
Unity 2017.2.0f2, 2017.3.0f2, 2018.1.0a1

Occurring on:
Unity 2018.1.0a7, 2018.1.0a6, 2018.1.0a5, 2018.1.0a4, 2018.1.0a3, 2018.1.0a2 , 2018.1.0b1 , 2018.1.0b13, 2018.2.0a1, 2018.2.0a7

Environment:
Occurring only on MacOs

Note:
Save Preset is introduced in 2018.1.0a1.
Design of Saving preset is different in 2018.1.0a2 with respect to 2018.1.0a1.

Stack Trace:
EndLayoutGroup: BeginLayoutGroup must be called first.
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)