Expedition Logbook crashes on rare Runic monster kill

Tried multiple logbooks with both normal run and no runic powers. Crashes on first runic monster kill.

Should note that i've never seen the runic rare monster "fully" die. Game freezes for a mili sec when the mobs hp bar is depleted (going down to what seems 0%) and sent back to login screen with a message saying an unexpected error occured.

Edit: I'm using flame wall to summon exploding srs with skeleton reavers. Flammability and pain offering.