Database error - 1364 - Field 'rules' doesn't have a default value

[nier3]

Hi,

I have moved server on a new installation, before I had PHP 5.6 + MySQL 5.1 (I think).

On new server I have now PHP 7.0 + MySQL 5.7.19 (PHP MySQLi) + Ubuntu 16.04 but when I send a new thread or reply on forum I have SQL Error Like:

Code:

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MyBB has experienced an internal SQL error and cannot continue. [b]SQL Error:[/b] 1364 - Field 'rules' doesn't have a default value [b]Query:[/b] REPLACE INTO mybb_threadfields_data(`portalimg`,`scadenza`,`mostraonascondi`,`link`,`tid`) VALUES(0,'','','',20213)

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portalimg, scadenza, mostraonascondi, link are all Custom Thread Fields.

Table structure in MySQL:



I think my database is messed up

It wants default value, so I flag "default" and add 0 to rules, go to save but "BLOB, TEXT, GEOMETRY or JSON column 'rules' can't have a default value"  but whyyyy, do you want or not this default value!?