* @return void
*/
protected final function addInstance ($group, $poolName, Visitable $visitableInstance) {
+ /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('POOL[' . __METHOD__ . ':' . __LINE__ . ']: group=' . $group . ',poolName=' . $poolName . ',visitableInstance=' . $visitableInstance->__toString() . ' - CALLED!');
+
+ // Make sure the group is not 'invalid'
+ assert($group != 'invalid');
+
// Is the pool group there?
if (!$this->getPoolEntriesInstance()->isGroupSet($group)) {
// Create the missing pool group