tinymce4mambo 0.5 and mambo 4.5 (1.0.8)

Hello !
I'm new to mambo but I get the whole thing quite quickly

I have still one problem though :
I'm trying to install tinymce4mambo 0.5 on mambo 4.5 (1.0.8) and when editing an item I got :
Warning: mysql_query(): Unable to save result set in /var/www/xxxxx/classes/database.php on line 143

and when I save it popup a javascript error with a huge SQL request.

no problem with 0.4.

Anybody experienced this?

By the way, with 0.4 I can't get a preview of the item being edited