diff --git a/src/null-ptrs.h b/src/null-ptrs.h
new file mode 100644
index 0000000..0dfd3f2
--- /dev/null
+++ b/src/null-ptrs.h
@@ -0,0 +1,35 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2013, Regents of the University of California
+ *                     Yingdi Yu
+ *
+ * BSD license, See the LICENSE file for more information
+ *
+ * Author: Yingdi Yu <yingdi@cs.ucla.edu>
+ */
+
+#ifndef NULL_PTRS_H
+#define NULL_PTRS_H
+
+#include <string>
+#include <ndn-cpp/util/blob.hpp>
+#include <ndn-cpp/data.hpp>
+#include "contact-item.h"
+#include "endorse-certificate.h"
+#include "profile.h"
+#include <ndn-cpp/security/certificate/identity-certificate.hpp>
+#include <ndn-cpp/security/policy/validation-request.hpp>
+
+
+static std::string CHRONOCHAT_NULL_STR;
+static ndn::Blob CHRONOCHAT_NULL_BLOB;
+
+static ndn::ptr_lib::shared_ptr<ContactItem> CHRONOCHAT_NULL_CONTACTITEM_PTR;
+static ndn::ptr_lib::shared_ptr<ndn::Data> CHRONOCHAT_NULL_DATA_PTR;
+static ndn::ptr_lib::shared_ptr<EndorseCertificate> CHRONOCHAT_NULL_ENDORSECERTIFICATE_PTR;
+static ndn::ptr_lib::shared_ptr<ndn::IdentityCertificate> CHRONOCHAT_NULL_IDENTITYCERTIFICATE_PTR;
+static ndn::ptr_lib::shared_ptr<Profile> CHRONOCHAT_NULL_PROFILE_PTR;
+static ndn::ptr_lib::shared_ptr<ndn::PublicKey> CHRONOCHAT_NULL_PUBLICKEY_PTR;
+static ndn::ptr_lib::shared_ptr<ndn::ValidationRequest> CHRONOCHAT_NULL_VALIDATIONREQUEST_PTR;
+
+#endif