Updating from RC1 to RC2 reported this error

Bionic Rooster

Well-known member
Update stopped with this error
An exception occurred: [XF\Db\Exception] MySQL statement prepare error [2006]: MySQL server has gone away in src/XF/Db/AbstractStatement.php on line 212

  1. XF\Db\AbstractStatement->getException() in src/XF/Db/Mysqli/Statement.php at line 174
  2. XF\Db\Mysqli\Statement->getException() in src/XF/Db/Mysqli/Statement.php at line 36
  3. XF\Db\Mysqli\Statement->prepare() in src/XF/Db/Mysqli/Statement.php at line 46
  4. XF\Db\Mysqli\Statement->execute() in src/XF/Db/AbstractAdapter.php at line 69
  5. XF\Db\AbstractAdapter->query() in src/XF/Session/DbStorage.php at line 57
  6. XF\Session\DbStorage->writeSession() in src/XF/Session/Session.php at line 215
  7. XF\Session\Session->save() in src/XF/Install/App.php at line 142
  8. XF\Install\App->complete() in src/XF/App.php at line 1866
  9. XF\App->run() in src/XF.php at line 328
  10. XF::runApp() in install/index.php at line 14

Chris D

XenForo developer
Staff member
This generally indicates MySQL server connectivity issues or timeouts.

Can generally be solved by changing wait_timeout and max_allowed_packet in my.cnf or similar.