Running applescript while screen saver is activated - applescript

Question

I wanted to play a iTunes folder playlist at certain time, I figured out this part myself.
But the thing is, I wanted to switch iTunes to mini player afterwards. So here's the code
tell application "iTunes" to quit
delay 5
tell application "iTunes"
reopen
activate
set song repeat to all
set shuffle enabled to true
set sound volume to 35
delay 5
get name of AirPlay devices
set selected of AirPlay device "Airport Express" to true
play playlist "mom's music"
end tell
delay 20
-- here comes the part I don't get
tell application "System Events"
tell process "iTunes"
set frontmost to true
if title of window 1 is "미니 플레이어" then
click menu item 9 of menu 9 of menu bar 1
delay 5
click menu item 9 of menu 9 of menu bar 1
else
click menu item 9 of menu 9 of menu bar 1
end if
end tell
end tell
never mind the upper parts. Please take a look the part with "System Events".
It does work just as expected when screen saver is NOT running, but it doesn't when screen saver is running, but I can't figure out what I missed.
So, is there another limitation running applescript under screen saver I'm not aware of? Any suggestions would be appreciated. Thanks.
2017-09-17 add
I came to notice when I press "Window" menu item, iTunes (the main one) window disappears. Would that mean I have to be beyond screen saver to do anything with windows through applescript?

Answer 1

It appears that when the screen saver is running, the script will still run but not process certain events. The workaround is to stop the screen saver before running any code that depends on UI Scripting, in this case.
Example:
tell application "System Events"
key code 53 -- # Esc key.
delay 1 - # Adjust as necessary, the screen saver needs to have stopped before continuing.
tell process "iTunes"
set frontmost to true
if title of window 1 is "미니 플레이어" then
click menu item 9 of menu 9 of menu bar 1
delay 5
click menu item 9 of menu 9 of menu bar 1
else
click menu item 9 of menu 9 of menu bar 1
end if
end tell
end tell

Answer 2

Try this version
try
tell application id "com.apple.ScreenSaver.Engine" to quit
end try
tell application "System Events"
tell process "iTunes"
set frontmost to true
if title of window 1 is "미니 플레이어" then
click menu item 9 of menu 9 of menu bar 1
delay 5
click menu item 9 of menu 9 of menu bar 1
else
click menu item 9 of menu 9 of menu bar 1
end if
end tell
end tell