#define z_is_true zend_is_true
#define smart_str_s(ss) (ss)->s
-#define smart_str_v(ss) (ss)->s->val
-#define smart_str_l(ss) (ss)->s->len
+#define smart_str_v(ss) (smart_str_s(ss)?(ss)->s->val:NULL)
+#define smart_str_l(ss) (smart_str_s(ss)?(ss)->s->len:0)
/* clear result object associated with a result handle */
extern void php_pqres_clear(PGresult *r);