Fix bug.

announcement.gemspec

@@ -249,6 +249,7 @@ if bundle_update_flag
     r.each do |mode,v1|
       v1.each do |clients,d|
         d.each do |k,v|
+          next if v.class != Hash
           if !v["username"].nil?
             if v["options"].nil?
               v["options"] = {}