Rman duplicate target database from active - ora-00600

@tfpdg1

In oracle 12.1.0.2, I'm trying to duplicate a source non-container database to a target on another server. When it gets to the

sql clone "alter system set spfile=  ...    step, it fails with

RMAN-03002: failure of Duplicate Db command at 09/22/2017 11:12:51

RMAN-05501: aborting duplication of target database

RMAN-03015: error occurred in stored script Memory Script

RMAN-06136: ORACLE error from auxiliary database: ORA-00600: internal error code

, arguments: [], [], [], [], [], [], [], [], [], [], [], []

Here is my rman script:

connect target 'sys/<pwd>@tfpdg1'

connect auxiliary 'sys/<pwd>@tfpdup'

set echo on

run {

allocate channel prmy1 type disk;

allocate channel prmy2 type disk;

allocate channel prmy3 type disk;

allocate channel prmy4 type disk;