Problem description:
the problem is that somehow random people get bugged, when they logg in they cause a error making more people relogg into a old savefile, the game is using the characterhandling library from daedron. i have no idea what might cause this or how to fix this, any help would be appreciated.

Search for "rollback" on the forums. Here's 1 post that might be helpful: [link]
I had the same problem. My problem was that my battle used turfs to decide where to send the player, and I added them into a list to be less CPU intensive, which caused it to save any players that were in it, so if you were in a party and logged out, you would create that bug onto yourself.

Or now that I think about it, it would probably do it if someone was battling at the time you logged out... anyways, point of the story, DON'T SAVE TURFS... it does mean things.

Also, I suggest reading the other posts in the thread, there is another example of stuff not to save in there. Probably check for more posts too if you want.