Google Chrome WhatsApp tab

set urlMustContain to "web.whatsapp.com"

tell application "Google Chrome" to tell its window 1
    activate
    set tabExists to (tabs whose URL contains urlMustContain) exists
    if tabExists then
        set allTabs to every tab
        set tabIndex to 1
        repeat with i from 1 to count of allTabs
            set thisTab to item i of allTabs
            if URL of thisTab contains urlMustContain then
                set active tab index to tabIndex
                exit repeat
            else
                set tabIndex to tabIndex + 1
            end if
        end repeat
    else
        return
    end if
end tell