OnBeforeWrite.php

<?php

public function onBeforeWrite(){
	parent::onBeforeWrite();
	
	$siteConfig = SiteConfig::current_site_config();
	if(!$siteConfig->StoreKey){
		$key = FoxyCart::setStoreKey();
+       	while(!ctype_alnum($key)){
+       		$key = FoxyCart::setStoreKey();
+       	}
+       	$siteConfig->StoreKey = $key;
	}
	
}