SQL Error when creating New Forums/ child forums

[nier3]

Hi, I have this problem, I tried to change in 'varchar(255) default \'\'', file "xt_install.php" but nothing, always error when I try to add a new forum or category

PHP Code:

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MyBB SQL Error MyBB has experienced an internal SQL error and cannot continue. SQL Error: 1364 - Field 'xthreads_tplprefix' doesn't have a default value Query: INSERT INTO mybb_forums (`name`,`description`,`linkto`,`type`,`pid`,`parentlist`,`disporder`,`active`,`open`,`allowhtml`,`allowmycode`,`allowsmilies`,`allowimgcode`,`allowvideocode`,`allowpicons`,`allowtratings`,`usepostcounts`,`usethreadcounts`,`requireprefix`,`password`,`showinjump`,`style`,`overridestyle`,`rulestype`,`rulestitle`,`rules`,`defaultdatecut`,`defaultsortby`,`defaultsortorder`) VALUES ('xdfsds','','','f',1,'',2,1,1,1,1,1,1,1,1,1,1,1,0,'',1,0,0,0,'','',0,'','')

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I have
MyBB Version 1.8.15
PHP Version 7.1.7
SQL Engine MySQLi 5.7.19

Maybe I have to re-install Xthreads plugin? (((

Thank you

EDIT: I tried to deactivate, uninstall and install again xthreads on a forum test and yes, with new version of xt_install.php (with varchar) now I can add new forums.

The problem is if I uninstall xthreads on my main forum, with all data threads etc I will lost all