Unknown Database Error

[MayerZwo]

Hello

Since a few Weeks I`m getting daily a few Mails with the following MySQL Error:


Invalid SQL:

SELECT *
FROM vb3_style
WHERE (styleid = 4 AND userselect = 1)
OR styleid = 4
ORDER BY styleid ASC
LIMIT 1;

MySQL-Error : MySQL server has gone away
Error-No. : 2006


I can not reproduce this Error.
It seems not be a big Problem, but I would like to know how to get rid of it.

As I don`t know much about MySQL, I hope anyone here can give me a Hint.
vBulletin Version is 4.1.11

Best regards
Michael