PHP warning in karma conf page

Hi

I just installed simple_karma on a drupal 5.2 system and immediately received a PHP warning on the configuration page. The warning states: warning: Invalid argument supplied for foreach() in /opt/drupal-5.2/includes/form.inc on line 948.

Line 948 contains the following:

function form_select_options($element, $choices = NULL) {
  if (!isset($choices)) {
    $choices = $element['#options'];
  }
  // array_key_exists() accommodates the rare event where $element['#value'] is NULL.
  // isset() fails in this situation.
  $value_valid = isset($element['#value']) || array_key_exists('#value', $element);
  $value_is_array = is_array($element['#value']);
  $options = '';
  <b>foreach ($choices as $key => $choice) {</b> // this is line 948
    if (is_array($choice)) {
...

Any idea why this happens?

The module seems to work fine.