Editor crashes on removing vuforia resource files after disabling "Vuforia Augmented Reality Supported" in XR settings

Steps to Repro:
1. Create a new project.
2. Edit > Project Settings > player settings > Player.
3. Enable "Vuforia Augmented Reality" checkbox from XR settings.
4. Disable "Vuforia Augmented Reality" checkbox.
5. Select "Remove Files" on "Disabling Vuforia" pop-up.

Observe the crash

Reproducible on:
2018.2.0a8, 2018.2.0a6, 2018.2.0a4.

Working fine on:
2018.1.0f1, 2018.1.0b13, 2017.3.0f3, 2017.2.0f3.

Environment:
Occurring on Windows 10, Windows 7, Mac 10.13, Mac 10.12.

Note:

1. On 2018.2.0a3 , 2018.2.a2 & 2018.2.0a1 following Exception is thrown continuously
"ArgumentException: There must be 2, 3 or 4 components in the version string" and editor doesn't crash.

2. On 2018.1.0b13, 2018.1.0f1, 2017.3.0f3 & 2017.2.0f3 following Exception is thrown
"MissingReferenceException: The object of type 'VuforiaConfiguration' has been destroyed but you are still trying to access it", and editor doesn't crash.

3. Sometimes an editor doesn't crash on disabling Vuforia once, crashes after disabling twice or thrice.