On performing undo operation over a prefab which has animation keyframes recorded using an animation window docked in the editor cause to throw InvalidOperationException also while selecting keyframe in animation window same exception thrown continuously, refer attached video.

Steps to Reproduce:
1. Create a New Project
2. Hierarchy > Create > 3D Object > Cube
3. Window > Animation > Animation(Ctrl+6)
4. Record an animation keyframe for GameObject(Cube)
5. Make a Prefab of GameObject(Cube)
6. Edit > Undo Selection Change

Actual Result:
1. InvalidOperationException is thrown on performing "Undo Selection Change" over a prefab which has animation keyframes recorded and animation window is docked
2. InvalidOperationException is thrown continuously on changing the recorded keyframe using mouse after performing "Undo Selection Change" over a prefab

Expected:
"Undo Selection Change" operation performed gracefully

Note: Refer attached AnimationStacktrace.docx

Occurring on:
2020.2.0a4, 2020.2.0a1, 2020.1.0b3, 2020.1.0a8

Working fine on:
2020.1.0a7, 2019.3.6f1

Environment:
Windows 10 and macOS 10.14