When duplicating a tab in the item configuration form and pressing Esc key during the form load, the user may get stuck on a gray screen instead of being redirected to the item list.

Steps to reproduce:

1. Open the item configuration form.
2. Duplicate the current tab.
3. While the form is loading in the new tab, press the Ecs key.

Result: The user remains on a gray screen and cannot proceed.

Expected: The user is redirected to the item list of the previously selected host.

Note1: the issue observed with 3G network speed.

Note2: also observed with trigger, host and graph modal forms.