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Ошибка Fatal error: Call to a member function apiVersions() on null

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Помогите решить проблему или подскажите где искать. Ставлю официальный модуль RetailCRM, почему-то при сохранении настроек вылазить ошибка Fatal error: Call to a member function apiVersions() on null in /home/admin/controller/extension/module/retailcrm.php on line 622 Вот функция на которую ругается. Строка 622 - $response = $apiClient->apiVersions();


private function validate()
        $versionsMap = array(
            'v3' => '3.0',
            'v4' => '4.0',
            'v5' => '5.0'

        if (!empty($this->request->post[$this->moduleTitle . '_url']) && !empty($this->request->post[$this->moduleTitle . '_apikey'])) {
            $apiClient = $this->retailcrm->getApiClient(
                $this->request->post[$this->moduleTitle . '_url'],
                $this->request->post[$this->moduleTitle . '_apikey']

        $response = $apiClient->apiVersions();

        if ($response && $response->isSuccessful()) {
            if (!in_array($versionsMap[$this->request->post[$this->moduleTitle . '_apiversion']], $response['versions'])) {
                $this->_error['warning'] = $this->language->get('text_error_api');
        } else {
            $this->_error['warning'] = $this->language->get('text_error_save');

        if (!$this->user->hasPermission('modify', 'extension/module/retailcrm')) {
            $this->_error['warning'] = $this->language->get('error_permission');

        if (isset($this->request->post[$this->moduleTitle . '_collector']['custom']) &&
            $this->request->post[$this->moduleTitle . '_collector']['custom_form'] == 1) {
            $customField = $this->request->post[$this->moduleTitle . '_collector']['custom'];

            if (empty($customField['name']) && empty($customField['email']) && empty($customField['phone'])) {
                $this->_error['fields'] = $this->language->get('text_error_collector_fields');

        if (!$this->_error) {
            return true;
        } else {
            return false;

Пробовал ставить на чистый OpenCart, та же ошибка, сервер работает на CentOS 7, php 5.6.36, OpenCart

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Подскажите какой-то временный костыль чтобы запустить интеграцию или хотя бы объяснить что не так с данной строкой, почему приходит пустое значение, так как тех. поддержка данной CRM очень долго решает данный вопрос и пока что без результата.

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