diff --git a/qemu/scripts/qapi-visit.py b/qemu/scripts/qapi-visit.py
index 53e551ff..a1050651 100644
--- a/qemu/scripts/qapi-visit.py
+++ b/qemu/scripts/qapi-visit.py
@@ -172,6 +172,9 @@ void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s **obj, Error
     if (err) {
         goto out;
     }
+    if (!*obj) {
+        goto out_obj;
+    }
     switch ((*obj)->type) {
 ''',
                  c_name=c_name(name), promote_int=promote_int)
@@ -206,10 +209,13 @@ void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s **obj, Error
 ''')
 
     ret += mcgen('''
+    case QTYPE_NONE:
+        abort();
     default:
         error_setg(&err, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
                    "%(name)s");
     }
+out_obj:
     visit_end_alternate(v);
     if (err && visit_is_input(v)) {
         qapi_free_%(c_name)s(*obj);