Runtimes are funtimes!

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@2941 316c924e-a436-60f5-8080-3fe189b3f50e

code/game/objects/devices/PDA/cart.dm

@@ -532,6 +532,7 @@ Code:
 					for (var/obj/item/weapon/mop/M in world)
 						var/turf/ml = get_turf(M)
 
+						if(ml)
 							if (ml.z != cl.z)
 								continue
 

code/game/objects/structures.dm

@@ -80,7 +80,7 @@ obj/structure
 				Tsrc.ReplaceWithWall()
 				for(var/obj/machinery/atmospherics/pipe/P in Tsrc)
 					P.layer = 1
-				W:use(2)
+				if (W)	W:use(2)
 				del(src)
 			return
 

code/modules/mob/living/carbon/metroid/life.dm

@@ -354,6 +354,9 @@
 					Tempstun = 1
 
 				if(bodytemperature <= (T0C - 50)) // hurt temperature
+					if(bodytemperature <= 49) // sqrting negative numbers is bad
+						adjustFireLoss(200)
+					else
 						adjustFireLoss(round(sqrt(bodytemperature)) * 2)
 
 			else

code/modules/mob/mob_movement.dm

@@ -207,6 +207,7 @@
 				if(L.len == 2)
 					L -= mob
 					var/mob/M = L[1]
+					if(M)
 						if ((get_dist(mob, M) <= 1 || M.loc == mob.loc))
 							var/turf/T = mob.loc
 							. = ..()