System events script sometimes works, sometimes doesn't

This is a part of a bigger script that I isolated and have an issue with:

tell application "Google Chrome" to activate
delay 2
tell application "System Events"
	click ¬
		pop up button "Multi Layout Manager" of ¬
		toolbar 1 of group 1 of window 1 of ¬
		application process "Chrome"
	delay 0.2
	repeat 3 times
		key code 48 -- # tab key
		delay 0.2
	end repeat
	key code 36 -- # enter key
end tell

It automatically clicks on a Chrome extension (Multi Layout Manager) and selects a saved template. Sometimes it works like a charm, then other times it just doesn't. The error I get is this:

error "System Events got an error: Can’t get pop up button \"Multi Layout Manager\" of toolbar 1 of group 1 of window 1 of application process \"Chrome\"." number -1728 from pop up button "Multi Layout Manager" of toolbar 1 of group 1 of window 1 of application process "Chrome"

I can't figure out what's wrong here. Some help would be great. thank you