Error in framelistener: Need a skeleton to attach the arrow to
Steps to reproduce:
Equip a crossbow and bolts
Equip a sword (note that the preview does not update at this point)
Close the inventory menu and open it again
Does not seem to happen with bows and arrows.
(RM-2332 from redmine: created on 2015-01-31 by Miroslav Remák, , closed on 2015-02-01 by scrawl .)