PHP Notice when calling get_user

[mukeshgami]

When try to get user object by calling get_user('_id') it throws PHP Notice below

PHP Notice: Undefined property: stdClass::$http_code in .../SynapsePHP-master/synapse_rest/HttpClient.php on line 19

Notice: Undefined property: stdClass::$http_code in .../SynapsePHP-master/synapse_rest/HttpClient.php on line 19
PHP Notice: Undefined property: stdClass::$http_code in .../SynapsePHP-master/synapse_rest/client.php on line 92

Notice: Undefined property: stdClass::$http_code in /Users/mukeshgami/Development/PHP/SynapsePHP-master/synapse_rest/client.php on line 92
PHP Notice: Undefined property: stdClass::$error in .../SynapsePHP-master/synapse_rest/client.php on line 92

Notice: Undefined property: stdClass::$error in /Users/mukeshgami/Development/PHP/SynapsePHP-master/synapse_rest/client.php on line 92
PHP Notice: Trying to get property 'en' of non-object in .../SynapsePHP-master/synapse_rest/client.php on line 92

Notice: Trying to get property 'en' of non-object in /Users/mukeshgami/Development/PHP/SynapsePHP-master/synapse_rest/client.php on line 92
PHP Notice: Undefined property: stdClass::$error_code in .../SynapsePHP-master/synapse_rest/client.php on line 92

Notice: Undefined property: stdClass::$error_code in /Users/mukeshgami/Development/PHP/SynapsePHP-master/synapse_rest/client.php on line 92
PHP Notice: Undefined property: stdClass::$http_code in .../SynapsePHP-master/synapse_rest/HttpClient.php on line 19

Notice: Undefined property: stdClass::$http_code in .../SynapsePHP-master/synapse_rest/HttpClient.php on line 19
PHP Notice: Trying to get property 'http_code' of non-object in .../SynapsePHP-master/synapse_rest/HttpClient.php on line 77

Notice: Trying to get property 'http_code' of non-object in .../SynapsePHP-master/synapse_rest/HttpClient.php on line 77
PHP Notice: Trying to get property 'oauth_key' of non-object in .../SynapsePHP-master/synapse_rest/client.php on line 71

Notice: Trying to get property 'oauth_key' of non-object in .../SynapsePHP-master/synapse_rest/client.php on line 71