JS error when detaching during onChanging timer

Steps to Reproduce

run the attached example
focus the textbox and press ESC

Actual Result

JS error in console

Expected Result

no error (detach component and stop obsolete onChanging timer)

Debug Info

the example depends on the server's latency if the server responds quicker than the onChanging timeout the problem happens, when tested in a low latency environment the problem happens less likely

Root Cause

after detaching the onChanging timer is still running not failing to access element detached in the mean time