PLSQL

good afternoon

Invalid number: In a program in pl Ora 01722 error occurs. This program not been modified, and detected the error occurs in the time to make a fetch. They change the fetch instruction select into and no error occurs.

Please assist us we could check for this case.

Add files with code, the file code with errors.sql show me this ORA 01722.  with code  code_correct.sql don't show me this ORA.

Thanks.