Quote from GreywindI'm getting that error too and i cant seem to resolve it either >.<
Quote fromalright figured it out and fixed it on my end so it won't happen again
basically what was happening is that the druid/shaman modules get deleted from memory if not used but their main table was a frame so when i put that through my frame deleter all its keys where deleted including all its functions this killing tiphooker since it tries to call a function on every frame to figure out if its a tooltip
check latest beta to see if it fixes things for you
updated to fix druid / shaman support please check 1.2.5b
If you're using Mounted like he was, get the new version of it.