Skip using IGNORE_ROW_ON_DUPKEY_INDEX Hint in 11.2. Wait until 12c. Your data can be corrupted by letting in duplicate rows.
Patch which might help is 11865420. However if PSU’s are installed on top of 11.2 then patch merge request must be issued to Oracle.
The IGNORE_ROW_ON_DUPKEY_INDEX hint stands on itself – it changes execution semantics. Looks like it is a last minute change in Oracle 11.