Python get pop-up box and click to confirm the error report UnexpectedAlertPresentException

alert = self.browser.switch_to_alert ();
sleep (2);
alert.accept ();
Click OK using this get pop-up box, sometimes it will report that UnexpectedAlertPresentException, sometimes does not have it, and I don"t know why.

Mar.05,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b31936-2bdbd.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b31936-2bdbd.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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