I have CK2+ 1.33.19 one but still happened like that
To you and other with crash issues: have you edited the CK2.exe to handle more than 2GB of data? This is exactly what I forgot to do when I returned to playing CK2 and tried bigger mods. Had frequent crashes when autosaving, edited the CK2.exe, no more crashes since.
EDIT: here is a link on how to do this manually: http://forum.paradoxplaza.com/forum/showthread.php?535848-FAQ-MEIOU-TD-Important-info-2Gb-Fix-Tutorial
or you can download this patch (haven't used it but is supposed to be self-explanatory): http://www.ntcore.com/4gb_patch.php