On selecting Ellipsis property under overflow dropdown when font asset is Bangers SDF causes the editor to throw NullReferenceException, refer attached video.

Steps to repro:
1. Create a new Project
2. Hierarchy > Create > Create Empty gameobject
3. Hierarchy > Create > 3D Objects > TMP Text - TextMeshPro
4. Inspector > Font Asset > Bangers SDF > Select
5. Inspector > Overflow > Ellipsis > Select

Actual Result:
NullReferenceException is thrown on selecting Ellipsis property under overflow dropdown.

Expected Result:
Ellipsis property is selected without errors and with any font assigned.

Tested with Unity versions:
2020.1.0a18, 2019.3.0f5

Package found version: preview.3 - 3.0.0, preview.1 - 3.0.0

Package working fine version: 2.0.1

Environment:
Windows10 and macOS 10.14

Stack trace:
NullReferenceException: Object reference not set to an instance of an object
TMPro.TextMeshPro.GenerateTextMesh () (at library/packagecache/com.unity.textmeshpro@3.0.0-preview.3/scripts/runtime/tmpro_private.cs:2963)
TMPro.TextMeshPro.OnPreRenderObject () (at library/packagecache/com.unity.textmeshpro@3.0.0-preview.3/scripts/runtime/tmpro_private.cs:1587)
TMPro.TextMeshPro.Rebuild (UnityEngine.UI.CanvasUpdate update) (at library/packagecache/com.unity.textmeshpro@3.0.0-preview.3/scripts/runtime/textmeshpro.cs:261)
TMPro.TMP_UpdateManager.DoRebuilds () (at library/packagecache/com.unity.textmeshpro@3.0.0-preview.3/scripts/runtime/tmp_updatemanager.cs:194)
TMPro.TMP_UpdateManager.OnCameraPreCull (UnityEngine.Camera cam) (at library/packagecache/com.unity.textmeshpro@3.0.0-preview.3/scripts/runtime/tmp_updatemanager.cs:160)
UnityEngine.Camera.FireOnPreCull (UnityEngine.Camera cam) (at <a3d417b16c80486ca3272865b9417295>:0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)