Guard against nil author or author emails in the Mailer.

app/models/mailer.rb

@@ -387,7 +387,7 @@ class Mailer < ActionMailer::Base
     # Removes the current user from the recipients and cc
     # if he doesn't want to receive notifications about what he does
     @author ||= User.current
-    if @author.pref[:no_self_notified]
+    if @author && @author.mail && @author.pref[:no_self_notified]
       recipients((recipients.is_a?(Array) ? recipients : [recipients]) - [@author.mail]) if recipients.present?
       cc((cc.is_a?(Array) ? cc : [cc]) - [@author.mail]) if cc.present?
     end