ErrorControllerSelector.php

<?php

class WS_ErrorControllerSelector extends Zend_Controller_Plugin_Abstract {

    public function routeShutdown(Zend_Controller_Request_Abstract $request) {
        $front = Zend_Controller_Front::getInstance();

        //If the ErrorHandler plugin is not registered, bail out
        if (!($front->getPlugin('Zend_Controller_Plugin_ErrorHandler') instanceOf Zend_Controller_Plugin_ErrorHandler))
            return;

        $error = $front->getPlugin('Zend_Controller_Plugin_ErrorHandler');

        //Generate a test request to use to determine if the error controller in our module exists
        $testRequest = new Zend_Controller_Request_Http();
        $testRequest->setModuleName($request->getModuleName())
                ->setControllerName($error->getErrorHandlerController())
                ->setActionName($error->getErrorHandlerAction());

        //Does the controller even exist?
        if ($front->getDispatcher()->isDispatchable($testRequest)) {
            $error->setErrorHandlerModule($request->getModuleName());
        }
    }

}
?>