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Kindly help me sort this out ,

[09-Feb-2019 09:48:51 Asia/Kolkata] Request URI: /index.php?main_page=checkout_process, IP address: 1.136.104.64
#1 shipping->__construct() called at [/includes/modules/checkout_process.php:105]
#2 require(/includes/modules/checkout_process.php) called at [/includes/modules/pages/checkout_process/header_php.php:27]
#3 require(/includes/modules/pages/checkout_process/header_php.php) called at [/index.php:36]

[09-Feb-2019 09:48:51 Asia/Kolkata] PHP Warning: Illegal string offset 'id' in /includes/classes/shipping.php on line 32
[09-Feb-2019 09:48:51 Asia/Kolkata] Request URI: /index.php?main_page=checkout_process, IP address: 1.136.104.64
#1 shipping->__construct() called at [/includes/modules/checkout_process.php:105]
#2 require(/includes/modules/checkout_process.php) called at [/includes/modules/pages/checkout_process/header_php.php:27]
#3 require(/includes/modules/pages/checkout_process/header_php.php) called at [/index.php:36]

[09-Feb-2019 09:48:51 Asia/Kolkata] PHP Warning: Illegal string offset 'id' in /includes/classes/shipping.php on line 32

Code at line 32 of shipping.php
[CODE ] if ( (zen_not_null($module)) && (in_array(substr($module['id'], 0, strpos($module['id'], '_')) . '.' . substr($PHP_SELF, (strrpos($PHP_SELF, '.')+1)), $this->modules)) ) {[/CODE]


code at line 105 of
[CODE ]
$shipping_modules = new shipping($_SESSION['shipping']);[/CODE]

PHP Version: 7.0.33 (Zend: 3.0.0)