An unhandled exception occurred at $004788C2
ERangeError: Range check error
$004788C2  TPLAYER__DOFIRE, Line 711 of dfplayer.pas
$0047A7AF  TPLAYER__AICONTROL, line 1056 of dfplayer.pas
$0049362B  TBEING__ACTION, line 590 of dfbeing.pas
$00411202  TDOOM__RUN, line 371 of doombase.pas
$00401AFD  main, line 31 of doomrl.pas
Windows version of 0.9.9, OS is Windows XP.
Was on level 8 Phobos Base, maze level, unique generated (Blaster).  Went to Inventory to switch from combat shotgun to Blaster and selected "Fire" towards a Lost Soul, and got this crash message.  First time the program's crashed on me.
Saved game, reloaded Level 8, got to keep the Blaster.
Crashed again when trying to fire Blaster at former human, exact same message.  Reload, hit "F" to fire with Blaster, same crash.  Switching back to shotgun lets me work normally.
Level 4 Marine, Perks are:
Reloader (2)
Shottyman
Tough as Nails (1)
Current savegame is still going, Blaster in inventory.
Died to Arachnotron on L10, Hell's Armory.  Can attach mortem if needed, nothing special.