The introduction of layout file layout () {} how to solve the problem if there is no session in it?

 layout (context) {
    return "blog"
  }

the introduction of layout file layout () {} what if there is no session in it?

Jun.27,2021
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-64f5-1b32c01-2be36.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b32c01-2be36.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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