HELP! Node editor crasing

hi, i’ve been working in a project all the week. everything was goining well until this mornin, when i try to open the node editor blender crashes. i dont have anything complex in the scene nor the comp (just two curve nodes, one color balance and a lens distort, just that…) it just happened, and i dont know why. ill try to upload the file so anyone could check it out (its about 200 mb). does this have happened to anyone before? any idea why is it happening?

so, yeah, ive solved it. somehow i left a composite node inside the node group…, i just had to mute it in the outliner, and taraaaa… the node editor openend normaly, so the node group did also. then i just had to delete it.