Default client crash message:
java.lang.NullPointerException: No image in gfx/invobjs/gems/gemstone
at haven.GameUI$NKeyBelt.draw(GameUI.java:1245)
at haven.Widget.draw(Widget.java:699)
at haven.Widget.draw(Widget.java:704)
at haven.GameUI.draw(GameUI.java:765)
at haven.Widget.draw(Widget.java:699)
at haven.Widget.draw(Widget.java:704)
at haven.RootWidget.draw(RootWidget.java:66)
at haven.UI.draw(UI.java:141)
at haven.HavenPanel.rootdraw(HavenPanel.java:303)
at haven.HavenPanel.run(HavenPanel.java:557)
at java.lang.Thread.run(Unknown Source)
Caused by: an attempt to put a gemstone on the hotkey bar