Originally Posted by
FGMax
Yeah this was going on with healing in addition to it not applying it correctly. The extension mentioned in the error though is the Better Combat Effects and I have reported this on that thread. I'll test to see if it also affects attacks if I have time.
Edit: Tested damage and it also throws the error. It seems to occur while running both BCE and this extension, updated my post on that thread too.
Edit 2: Conflict seems to be more with this extension, may be beyond the scope depending on whether you BCE or not. /console skip could take care of this in the meantime since it doesn't seem to have any other effect.