diff --git a/lib/gitlab/auth.rb b/lib/gitlab/auth.rb
index 500cb64df48016a905711a49d02ddb84810c1ba7..ee28497f0681be20a02708bfc62a3646045193d6 100644
--- a/lib/gitlab/auth.rb
+++ b/lib/gitlab/auth.rb
@@ -20,8 +20,9 @@ module Gitlab
     def create_from_omniauth(auth, ldap = false)
       provider = auth.provider
       uid = auth.info.uid || auth.uid
-      name = auth.info.name.force_encoding("utf-8")
-      email = auth.info.email.downcase unless auth.info.email.nil?
+      uid = uid.to_s.force_encoding("utf-8")
+      name = auth.info.name.to_s.force_encoding("utf-8")
+      email = auth.info.email.to_s.downcase unless auth.info.email.nil?
 
       ldap_prefix = ldap ? '(LDAP) ' : ''
       raise OmniAuth::Error, "#{ldap_prefix}#{provider} does not provide an email"\