BUG: Crashing due to an illegal operation!
proc name: apply edge overlay (/turf/simulated/floor/plating/airless/asteroid/proc/apply_edge_overlay)
  source file: mining.dm,1286
  usr: Alejandro Kellogg (/mob/living/carbon/human)
  src:  (229,107,1) (/turf/simulated/floor/plating/airless/asteroid)
  usr.loc:  (229,107,1) (/turf/simulated/floor/plating/airless/asteroid)
  call stack:
 (229,107,1) (/turf/simulated/floor/plating/airless/asteroid): apply edge overlay(5)
 (229,107,1) (/turf/simulated/floor/plating/airless/asteroid): update icon()

Backtrace for BYOND 512.1423 on Linux:
Generated at Sun Jun 10 19:57:08 2018

DreamDaemon [0x8048000, 0x0], [0x8048000, 0x804bb24]
libbyond.so [0xf7237000, 0x0], 0x2575aa
linux-gate.so.1 [0xf77bd000, 0xf77bdd50], [0xf77bd000, 0xf77bdd50]
libbyond.so [0xf7237000, 0x0], 0x2575aa
libbyond.so [0xf7237000, 0x0], 0x258d2b
libbyond.so [0xf7237000, 0x0], 0x297a66
libbyond.so [0xf7237000, 0x0], 0x26ea3d
libbyond.so [0xf7237000, 0x0], 0x28b5f4
libbyond.so [0xf7237000, 0x0], 0x295073
libbyond.so [0xf7237000, 0x0], 0x297fbd
libbyond.so [0xf7237000, 0x0], 0x272daa
libbyond.so [0xf7237000, 0x0], 0x28b435
libbyond.so [0xf7237000, 0x0], 0x28d740
libbyond.so [0xf7237000, 0x0], 0x241de9
libbyond.so 0x35eef0, 0x35f00a
libbyond.so 0x325520, 0x325722
DreamDaemon [0x8048000, 0x0], [0x8048000, 0x804ae34]
libc.so.6 0x19970, 0x19a63 (__libc_start_main)
DreamDaemon [0x8048000, 0x0], [0x8048000, 0x804a731]

Recent proc calls:
/turf/simulated/floor/plating/airless/asteroid/proc/apply_edge_overlay
/turf/simulated/floor/plating/airless/asteroid/proc/apply_edge_overlay
/turf/simulated/floor/plating/airless/asteroid/proc/apply_edge_overlay
/turf/simulated/floor/plating/airless/asteroid/proc/apply_edge_overlay
/turf/simulated/floor/plating/airless/asteroid/proc/apply_edge_overlay
/turf/simulated/floor/plating/airless/asteroid/proc/apply_edge_overlay
/turf/simulated/floor/plating/airless/asteroid/proc/apply_edge_overlay
/turf/simulated/floor/plating/airless/asteroid/update_icon
/turf/simulated/floor/plating/airless/asteroid/proc/apply_edge_overlay
/turf/simulated/floor/plating/airless/asteroid/proc/apply_edge_overlay
/turf/simulated/floor/plating/airless/asteroid/proc/apply_edge_overlay
/turf/simulated/floor/plating/airless/asteroid/proc/apply_edge_overlay
/turf/simulated/floor/plating/airless/asteroid/proc/apply_edge_overlay
/turf/simulated/floor/plating/airless/asteroid/proc/apply_edge_overlay
/turf/simulated/floor/plating/airless/asteroid/proc/apply_edge_overlay
/turf/simulated/floor/plating/airless/asteroid/update_icon

To help the BYOND developers debug this, please send the above trace as part
of a very detailed bug report: http://www.byond.com/members/?command=view_tracker&tracker=1