- ASSERT (p != 0);
- error = vnet_hw_interface_set_class_helper (vnm, hif->hw_if_index, p[0], /* redistribute */ 0);
+ if (p)
+ {
+ error = vnet_hw_interface_set_class_helper
+ (vnm, hif->hw_if_index, p[0], /* redistribute */ 0);
+ }
+ else
+ error = clib_error_return (0, "hw class %s AWOL?", class_name);
+