Crash in event code

Place the mouse pointer over the scrollbar, evaluate the following code and drag the scrollbar: (event-over-modeline-p (next-event)) For me, it crashes: Fatal error: assertion failed, file /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/frame.h, line 210, RECORD_TYPEP (_obj, lrecord_frame) || MARKED_RECORD_P (_obj) #0 0xef1748d4 in kill () #1 0x997bc in fatal_error_signal (sig=6) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/emacs.c:262 #2 <signal handler called> #3 0xef1748d4 in kill () #4 0x9d4a0 in assert_failed ( file=0x2a9ad8 "/home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/frame.h", line=210, expr=0x2a9b18 "RECORD_TYPEP (_obj, lrecord_frame) || MARKED_RECORD_P (_obj)") at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/emacs.c:2595 #5 0xb76bc in event_pixel_translation (event={...}, char_x=0x0, char_y=0x0, obj_x=0x0, obj_y=0x0, w=0x0, bufp=0x0, closest=0x0, modeline_closest=0x0, obj1=0x0, obj2=0x0) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/events.c:1706 #6 0xb795c in Fevent_over_modeline_p (event={...}) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/events.c:1773 #7 0xa76b4 in Feval (form={...}) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/eval.c:3063 #8 0xa8370 in funcall_recording_as (recorded_as={...}, nargs=1, args=0xefffe180) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/eval.c:3197 #9 0xa87d0 in Ffuncall (nargs=2, args=0xefffe180) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/eval.c:3238 #10 0x63334 in Fbyte_code (bytestr={...}, vector={...}, maxdepth={...}) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/bytecode.c:416 #11 0xaa490 in funcall_lambda (fun={...}, nargs=1, arg_vector=0xefffe960) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/eval.c:3599 #12 0xa86f8 in funcall_recording_as (recorded_as={...}, nargs=1, args=0xefffe95c) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/eval.c:3214 #13 0xa87d0 in Ffuncall (nargs=2, args=0xefffe95c) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/eval.c:3238 #14 0x63334 in Fbyte_code (bytestr={...}, vector={...}, maxdepth={...}) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/bytecode.c:416 #15 0xaa490 in funcall_lambda (fun={...}, nargs=1, arg_vector=0xefffef7c) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/eval.c:3599 #16 0xa86f8 in funcall_recording_as (recorded_as={...}, nargs=1, args=0xefffef78) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/eval.c:3214 #17 0xa87d0 in Ffuncall (nargs=2, args=0xefffef78) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/eval.c:3238 #18 0x68950 in Fcall_interactively (function={...}, record_flag={...}, keys={...}) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/callint.c:935 #19 0xa5818 in Fcommand_execute (cmd={...}, record={...}, keys={...}) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/eval.c:2584 #20 0xf8a9c in execute_command_event (command_builder=0x453e40, event={...}) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/event-stream.c:4343 #21 0xf99cc in Fdispatch_event (event={...}) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/event-stream.c:4634 #22 0x7166c in Fcommand_loop_1 () at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/cmdloop.c:579 #23 0x7120c in command_loop_1 (dummy={...}) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/cmdloop.c:494 #24 0xa29b4 in condition_case_1 (handlers={...}, bfun=0x71178 <command_loop_1>, barg={...}, hfun=0x7180c <cmd_error>, harg={...}) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/eval.c:1653 #25 0x71930 in command_loop_2 (dummy={...}) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/cmdloop.c:256 #26 0xa2264 in internal_catch (tag={...}, func=0x718c0 <command_loop_2>, arg={...}, threw=0x0) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/eval.c:1328 #27 0x70688 in initial_command_loop (load_me={...}) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/cmdloop.c:305 #28 0x9bb50 in xemacs_21_0_b41_sparc_sun_solaris2_5_1 (argc=1, argv=0xeffffa54, envp=0xeffffa5c, restart=0) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/emacs.c:1692 #29 0x9c5f4 in main (argc=1, argv=0xeffffa54, envp=0xeffffa5c) at /home/srce/hniksic/work/emacs/xemacs-21.0-b41/src/emacs.c:2109 -- Hrvoje Niksic <hniksic(a)srce.hr&gt; | Student at FER Zagreb, Croatia --------------------------------+-------------------------------- Predestination was doomed from the start.