SE PRODUJO UNA EXCEPCIÓN

El identificador de categoría es nulo.
Pila de eventos:
#0 [internal function]: Motor_View_Helper_Url_Categoria->_Url_Categoria(NULL, false, NULL, NULL, NULL, Array)
#1 /var/www/www.soloporteros.com/library/Motor/views/helpers/Abstract.php(89): call_user_func_array(Array, Array)
#2 [internal function]: Motor_View_Helper_Abstract->__call('Url_Categoria', Array)
#3 [internal function]: Motor_View_Helper_Url_Categoria->Url_Categoria(NULL, false, NULL, NULL, NULL, Array)
#4 /var/www/www.soloporteros.com/library/Zend/View/Abstract.php(350): call_user_func_array(Array, Array)
#5 /var/www/www.soloporteros.com/library/Motor/views/helpers/Url/CategoriaCompleja.php(55): Zend_View_Abstract->__call('Url_Categoria', Array)
#6 /var/www/www.soloporteros.com/library/Motor/views/helpers/Url/CategoriaCompleja.php(55): Zend_View->Url_Categoria(NULL, false, NULL, NULL, NULL, Array)
#7 [internal function]: Motor_View_Helper_Url_CategoriaCompleja->_Url_CategoriaCompleja(NULL, Array, Array, 0, 0, NULL, NULL, NULL, NULL)
#8 /var/www/www.soloporteros.com/library/Motor/views/helpers/Abstract.php(89): call_user_func_array(Array, Array)
#9 [internal function]: Motor_View_Helper_Abstract->__call('Url_CategoriaCo...', Array)
#10 [internal function]: Motor_View_Helper_Url_CategoriaCompleja->Url_CategoriaCompleja(NULL, Array, Array, 0, 0, NULL, NULL, NULL, NULL)
#11 /var/www/www.soloporteros.com/library/Zend/View/Abstract.php(350): call_user_func_array(Array, Array)
#12 /var/www/www.soloporteros.com/library/Motor/views/helpers/FiltroProductos.php(1150): Zend_View_Abstract->__call('Url_CategoriaCo...', Array)
#13 /var/www/www.soloporteros.com/library/Motor/views/helpers/FiltroProductos.php(1150): Zend_View->Url_CategoriaCompleja(NULL, Array, Array, 0, 0, NULL, NULL, NULL, NULL)
#14 /var/www/www.soloporteros.com/library/Motor/views/scripts/productos/index.phtml(59): Motor_View_Helper_FiltroProductos->filtrosActuales(Array, Array, NULL, 0, 0, NULL, NULL, true)
#15 /var/www/www.soloporteros.com/library/Zend/View.php(108): include('/var/www/www.so...')
#16 /var/www/www.soloporteros.com/library/Zend/View/Abstract.php(888): Zend_View->_run('/var/www/www.so...')
#17 /var/www/www.soloporteros.com/library/Motor/controllers/ProductosController.php(642): Zend_View_Abstract->render('productos/index...')
#18 /var/www/www.soloporteros.com/library/Zend/Controller/Action.php(516): Motor_ProductosController->indexAction()
#19 /var/www/www.soloporteros.com/library/Motor/Dispatcher.php(175): Zend_Controller_Action->dispatch('indexAction')
#20 /var/www/www.soloporteros.com/library/Zend/Controller/Front.php(954): Motor_Dispatcher->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#21 /var/www/www.soloporteros.com/library/Zend/Application/Bootstrap/Bootstrap.php(97): Zend_Controller_Front->dispatch()
#22 /var/www/www.soloporteros.com/library/Zend/Application.php(366): Zend_Application_Bootstrap_Bootstrap->run()
#23 /var/www/www.soloporteros.com/public_html/index.php(74): Zend_Application->run()
#24 {main}