AppleScript: Count the number of open tabs in Safari

CountOpenSafariTabs.scpt

-- CountOpenSafariTabs.scpt
-- Author: Chad Armstrong
-- Date: 13 May 2016
-- Description: Count the number of open tabs in Safari
-- To run from CLI: osascript CountOpenSafariTabs.scpt

tell application "Safari"
	
	--Variables
	set winlist to every window
	set totaltabcount to 0
	
	-- Loop through each window to count the number of open tabs
	repeat with win in winlist
		try
			set tabcount to number of tabs in win
			set totaltabcount to totaltabcount + tabcount
			-- log "tab count: " & tabcount & " totaltabcount: " & totaltabcount
		on error errmsg
			-- Often getting error message like this: 
			-- "Safari got an error: AppleEvent handler failed."
			-- log "error message: " & errmsg
		end try
	end repeat
	
	log "There are " & totaltabcount & " Safari tabs open."
	
end tell