factor % ./factor
Error in thread 16 (UI update, [ self ui-thread set-global update-ui-loop ]):

Memory protection fault at address 0

(U) Quotation: [ set-namestack init-catchstack self quot>> call -> stop ]
(O) Word: update-ui-loop
(O) Word: update-ui
(O) Word: notify-queued
(O) Method: M\ world graft*
(O) Method: M\ x11-ui-backend (open-window)
(O) Word: gadget-window
(O) Word: create-xic
(O) Word: XCreateIC
(U) Quotation: [
        63 special-object error-thread set-global
        continuation -> error-continuation set-global
        [ original-error set-global ] [ rethrow ] bi
    ]