PHP error on saving new question, warning: function_exists() expects parameter 1 to be string, includes\form.inc on line 769

Well, I took a shot at the code, even though I am not at all a PHP coder. Seemed to me that the form validation (form.inc) was somehow annoyed at some null value in an array.

from form.inc, lines 756 to 762 (the error line)

function form_execute_handlers($type, &$form, &$form_state) {
  $return = FALSE;
  if (isset($form_state[$type .'_handlers'])) {
    $handlers = $form_state[$type .'_handlers'];
  }
  elseif (isset($form['#'. $type])) {
    $handlers = $form['#'. $type];
  }
  else {
    $handlers = array();
  }

  foreach ($handlers as $function) {
    if (function_exists($function))  {

So I commented out line 217 in faq_ask.module, the area that was commented as being concerned with validating the email field.

And whadda-ya-know, that got rid of the error. It works fine with and without the "Notify by E-mail (optional)" check box checked.

Here is the code block before I commented out that line:

  // Add validation of the e-mail field
  if (isset($form['#validate'])) {
    $temp_val = $form['#validate'];
   $form['#validate'] = array($temp_val);
 }
  else {
    $form['#validate'] = array();
  }
  $form['#validate'][] = 'faq_ask_form_validate';

after

217:  //   $form['#validate'] = array($temp_val);

Edit: We do not allow anonymous question submission, so this is only for authenticated users, so the email address field is hidden on our site.

Comments welcomed.

Alternate solution, after reading http://drupal.org/node/768260 it seemed better to do it this way, so it would work if/when we enable anonymous submissions.

On line 222 of faq_ask.module:

before

222: $form['#validate'][] = 'faq_ask_form_validate';

after

222: $form['#validate'] = array('faq_ask_form_validate');