TYPO3-Organiser: PHP Warning: Invalid argument supplied for foreach()

Core: Error handler (BE): PHP Warning: Invalid argument supplied for foreach() in ~typo3conf/temp_CACHED_psa2d2_ext_tables.php line 4087

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$TCA['fe_users']['columns']['tx_org_headquarters']['config_filter']['maxitems'] = 1;
$TCA['fe_users']['columns']['tx_org_headquarters']['config_filter']['size']     = 1;
$items = array ('-99' => array ( '0' => '', '1' => '' ));
foreach($TCA['fe_users']['columns']['tx_org_headquarters']['config']['items'] as $key => $arrValue)
{
  $items[$key] = $arrValue;
}
$TCA['fe_users']['columns']['tx_org_headquarters']['config_filter']['items'] = $items;
 
  // fe_users
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