[URGENT] Site crashes after 4.3 update

Hi,

I just did a full update to WP 4.3 and the error_log is getting filled by this:

Tue Aug 25 01:28:25 2015] [error] [client SOME.IP] Eroare baz\xc4\x83 de date WordPress Got a packet bigger than 'max_allowed_packet' bytes pentru interogarea UPDATEwp_optionsSEToption_value` = 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`

I have the files & folders before the update, but unfortunately not the old DB.

Any help is highly appreciated!