Thanks Klas, I don't know... I have desinstalled my T3 Framework and tried to put Joomla native templates. No way.
I have seen this in Joomla forum : https://forum.joomla.org/viewtopic.php?t=937746
I tried the patch but it didn't work for me. "This issue persists on every Joomla extensions that uses folderlist field".
Does Seblod uses this folderlist field ?