Падает постоянно сайт c ошибкой PHP Warning: array_merge() и PHP Fatal error: Class 'modContext_

Коллеги, нужна помощь!
Когда вношу правки на сайте и после сохранения сайт падает в логах ошибка

[Mon Jan 11 21:43:37 2016] [error] [client ] PHP Warning: array_merge() [<a href='function.array-merge'>function.array-merge</a>]: Argument #2 is not an array in /home//www/core/model/modx/modx.class.php on line 2412 
[Mon Jan 11 21:43:37 2016] [error] [client ] PHP Fatal error: Class 'modContext_' not found in /home//www/core/xpdo/xpdo.class.php on line 770
[Mon Jan 11 21:45:42 2016] [error] [client ] PHP Warning: array_merge() [<a href='function.array-merge'>function.array-merge</a>]: Argument #2 is not an array in /home//www/core/model/modx/modx.class.php on line 2412, referer: http://ххх.ru/manager/?a=66
[Mon Jan 11 21:45:42 2016] [error] [client ] PHP Fatal error: Class 'modContext_' not found in /home//www/core/xpdo/xpdo.class.php on line 770, referer: http://ххх.ru/manager/?a=66
[Mon Jan 11 21:45:43 2016] [error] [client ] PHP Warning: array_merge() [<a href='function.array-merge'>function.array-merge</a>]: Argument #2 is not an array in /home//www/core/model/modx/modx.class.php on line 2412
[Mon Jan 11 21:45:43 2016] [error] [client ] PHP Fatal error: Class 'modContext_' not found in /home//www/core/xpdo/xpdo.class.php on line 770

Сами функции, по которым ссылается на ошибку

По строке 2412

/**
     * Loads the modX system configuration settings.
     *
     * @access protected
     * @return boolean True if successful.
     */
    protected function _loadConfig() {
        $this->config= $this->_config;

        $this->getCacheManager();
        $config = $this->cacheManager->get('config', array(
            xPDO::OPT_CACHE_KEY => $this->getOption('cache_system_settings_key', 
null, 'system_settings'),
            xPDO::OPT_CACHE_HANDLER => 
$this->getOption('cache_system_settings_handler', null, 
$this->getOption(xPDO::OPT_CACHE_HANDLER)),
     
       xPDO::OPT_CACHE_FORMAT => (integer) 
$this->getOption('cache_system_settings_format', null, 
$this->getOption(xPDO::OPT_CACHE_FORMAT, null, 
xPDOCacheManager::CACHE_PHP))
        ));
        if (empty($config)) {
            $config = $this->cacheManager->generateConfig();
        }
        if (empty($config)) {
            $config = array();
            if (!$settings= $this->getCollection('modSystemSetting')) {
                return false;
            }
            foreach ($settings as $setting) {
                $config[$setting->get('key')]= $setting->get('value');
            }
        }
/**строка 2414*/        $this->config = array_merge($this->config, $config);
        $this->_systemConfig= $this->config;
        return true;
    }

По строке 770

/**
     * Creates a new instance of a specified class.
     *
     * All new objects created with this method are transient until {@link
     * xPDOObject::save()} is called the first time and is reflected by the
     * {@link xPDOObject::$_new} property.
     *
     * @param string $className Name of the class to get a new instance of.
     * @param array $fields An associated array of field names/values to
     * populate the object with.
     * @return object|null A new instance of the specified class, or null if a
     * new object could not be instantiated.
     */
    public function newObject($className, $fields= array ()) {
        $instance= null;
/**строка 770*/         if ($className= $this->loadClass($className)) {
            $className .=  '_' . $this->config['dbtype'];
            if ($instance= new $className ($this)) {
                if (is_array($fields) && !empty ($fields)) {
                    $instance->fromArray($fields);
                }
            }
        }
        return $instance;
    }