I'm attaching a pretty simple fix that prevents emailjs from getting stuck in an infinite loop (100 % CPU and increasing memory consumption until an allocation error terminates it) when it encounters an email address that is both invalid like john@smith@example.com and has a UTF-8 name encoded as base64 such as "=?UTF-8?B?w7bDtsO2?=". The problem arises from the fact that Address.prototype.getphraselist always returns an Array and Boolean([]) equals true and not false (therefore testing for length of the Array instead).