How to close popup modeless window form in js

How to close popup modeless window form in js.
Below is in process-
EXEC_SCRIPT 'AwareApp.m_curPopupWindow.window.close();'

I want to close form on javascript in render js code.

I tried
EXEC_SCRIPT 'AwareApp.m_curPopupWindow.window.close();' in process but gives me null error.

not sure if it will make any difference, but I have used the following:

EXEC_SCRIPT 'let win = AwareApp.m_curPopupWindow; win.window.close (); '

bruce

Thanks. I tried that as well. It shows same error.