"Requested frame does not exist" exception thrown while selected frame goes out of profiler window. It also happens with UI profiler.

Steps to repro:
1. Open _Complete-Game scene from the attached project.
2. Windows > Profiler > Add Profiler "Audio".
3. Select "Audio" > Play the scene.
4. Click on Channels/Groups > Select any frame from Audio Profiler section.
5. Exit from the Pause mode and observe the errors.

Actual result:
The console window is throwing "Requested frame does not exist" exception continuously.

NOTE: After throwing exceptions data for Stats, Channels, Group disappears.

Reproducible on:
2018.2.0a7, 2018.2.0a6.

Working fine on:
2018.2.0a5, 2018.2.0a1, 2018.1.0b13.

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