ORA-06512 - When trying to end gathering of system stats

Hi

We have a 11.2.0.4 database

we started collecting system stats on it few hours ago --> EXEC DBMS_STATS.gather_system_stats('start');

Now when we try to end this, we are getting this error

SQL> show user

USER is "SYS"

SQL> exec DBMS_STATS.GATHER_SYSTEM_STATS('stop');

BEGIN DBMS_STATS.GATHER_SYSTEM_STATS('stop'); END;

*

ERROR at line 1:

ORA-01426: numeric overflow

ORA-06512: at "SYS.DBMS_STATS", line 27727

ORA-06512: at line 1

Can someone please let us know as to what could be wrong here and IF the system stats are still being computed in the database since after starting it we are unable to stop it?