Submission is causing error 500 in ajax mode

First submission works fine.
After the first submission, other participants answers are processing via ajax submit while this mode is restricted to edit/delete actions.
This ajax submission mode for new answers is producing an error 500 in makemeeting_answer_js callback.

This is due to the fact that ajax callback has been added to the form while it should not.

In makemeeting_answers_form function, please fix the following loop by replacing $answer by $_answer and to avoid to name this loop variable like the function parameter that is tested after this loop.

// And add each answer to our results array for futher use
    foreach ($results as $result) {
      $_answer = unserialize($result->value);
      if (is_array($_answer)) {
        foreach ($_answer as $key => $value) {
          if ($value) {
            $answers[$key] = empty($answers[$key]) ? 1 : $answers[$key] + 1;
          }
        }
      }
      elseif (is_string($_answer) && $_answer) {
        $answers[$_answer] = empty($answers[$_answer]) ? 1 : $answers[$_answer] + 1;
      }
    }

Hope this will help.