here are the mods that may be causing problems:
fragile blocks
the spice of life
waystones
wizardry
reauth
attributefix
baubles
birds nest
tumbleweed
blood magic
magic bees
cooking for blockheads
block tweaker
forgiving void
Artisan Worktables
embers
soot
roots
extra alchemy
ice & fire
integrated dynamics & addons
locks
magical psi
opencomputers
pam's harvestcraft
placeable items
fast leaf decay
soul shards
thuamcraft & addons
Bewitchment
Akashic Tome
Bed Patch
Clumps
PlusTiC
RandomPatches
Building Gadgets
wings
.. i got a modpack with no problems, untill i added these mods. im showing all these mods not because they are for sure the cause but more of like if they have been reported to cause a crash with foamfix..
...lol sorry, ill check which one is causing the problem, i just didn't have the time right now.

edit: also it does not crash every time.. its like a 60-40 that it will crash.

removed "the spice of life" and it no longer seems to crash.