AppleScript not running in Alfred but does run in Script Editor?

[gingerbeardman]

The following AppleScript runs just fine in Script Editor (it clicks a user extension button of given description)

tell application "System Events"
	tell process "Safari"
		set extDesc to "Recent Tab List"
		
		tell first UI element of last group of last toolbar of first window
			click (first button where its description = extDesc)
		end tell
	end tell
end tell

...but nothing happens when I call it from within an Alfred workflow? Using either NSAppleScript or /usr/bin/osascript

 

Errors are:

[2019-03-14 11:47:19][ERROR: action.applescript] {
    NSAppleScriptErrorAppName = "System Events";
    NSAppleScriptErrorBriefMessage = "Can\U2019t get toolbar 1 of window 1 of process \"Safari\". Invalid index.";
    NSAppleScriptErrorMessage = "System Events got an error: Can\U2019t get toolbar 1 of window 1 of process \"Safari\". Invalid index.";
    NSAppleScriptErrorNumber = "-1719";
    NSAppleScriptErrorRange = "NSRange: {194, 57}";
}

[2019-03-14 11:47:19][ERROR: action.script] /Users/matt/Library/Caches/com.runningwithcrayons.Alfred-3/Workflow Scripts/C0150784-A54F-47EA-B559-C0306F7759D7:186:243: execution error: System Events got an error: Can’t get toolbar 1 of window 1 of process "Safari". Invalid index. (-1719)

 

Any ideas?

Edited March 14, 2019 by gingerbeardman

[Andrew]

@GingerbreadMan I'm seeing the same error in ScriptEditor:

 

[gingerbeardman]

Well, the example was just that. It will not work in circumstances where the layout of the Safari toolbar is different, which I suspect is the case for you?

 

But I'll confirm the OP and post more details when I can.  

Edited March 18, 2019 by gingerbeardman

[gingerbeardman]

OK, here is a test workflow: https://forumfiles.com/f8J8K7Sdm2/Safari_TEST_alfredworkflow

 

Further checking shows it works OK when called by keyword, but fails by keyboard shortcut?

 

Script Editor works when I invoke using the play button.