Здравствуйте! Такая проблема с ajax. Есть форма созданная через webform, открывается через ctools modal forms. Во всех браузерах отрабатывает нормально и на смартфонах и на декстопных, кроме Safari на iOS. При отправке формы вываливается такая ошибка:

An AJAX HTTP request terminated abnormally.
Debugging information follows.
Path: /modal_forms/ajax/webform/4147
StatusText: n/a
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ReadyState: undefined

Что делал для попытки исправить:
1. В settings.php раскомментировал $base_url
2. В .htaccess вставил строку php_value auto_append_file none

На данный момент убрал вывод ошибки через alert, а сделал вывод в консоль.
Сама форма работает и результат записывается. Куда копать для исправления ошибки?