Unable to quit Premiere Pro and After Effects on macOS 10.12.6

Premiere Pro and After Effects does not quit on macOS 10.12.6.

Description

In some instances, when you close After Effects and Premiere Pro, the application does not quit on macOS 10.12.6. 

A spinning wheel error is displayed.

Workaround

To resolve this issue switch to Software Only rendering, and close the application. If the application process does not quit, you must force quit.