PEAR ->update() (remove error message)

Please help,.. How to remove this message : MESSAGE: No Data Affected By update TYPE: PEAR DEBUG INFO: CODE: -5 The case : I have HTML Form so user can update their profile I use ->update() method when user click update button. But if User did not change the data in the FORM, and click the update button anyway,...how to remove this PEAR error message for this case only Thanks YUAN