[Linux] [FBX Exporter] ArgumentNullException is thrown on opening "Export Option" window

On opening "Export Option" window editor thrown ArgumentNullException, Reter attached video

Steps to repro:
1. Create a new project
2. Windows > Package Manager > FBX Exporter(4.0.0-pre.1)> Install
3. Hierarchy > Right -Click > 3D Object > Cube > Select
4.GameObjet > Export to FBX... > Select

Actual Result:
ArgumentNullException is thrown on the Opening Export Option window

Expected Result:
Export Option window open gracefully

Reproducible in Package Version: 4.0.0-pre.1

Reproducible on:
2021.1.0b3, 2021.1.0a7

Note: 1.The "FBX Exporter" Package introduced in 2021.1.0a7
2. Working fine in 2021.2.0a2

Environment: Occurs only on Linux

Tested on Ubuntu 18.04 LTS