Added a sanity check, added some feedback stuff to help identify WTF is happening with blood.

code/game/atom_procs.dm

@@ -141,7 +141,11 @@
 		return 0
 	if (!( src.flags ) & 256)
 		return
-	if (src.blood_DNA.len)
+	if(!blood_DNA)
+		var/turf/Z = get_turf(src)
+		world << "\red ERROR: [src] at [Z.x], [Z.y], [Z.z] is missing it's blood_DNA list!  Tell a dev!"
+		return
+	if (blood_DNA.len)
 		if (istype(src, /obj/item)&&!istype(src, /obj/item/weapon/melee/energy))//Only regular items. Energy melee weapon are not affected.
 			var/obj/item/source2 = src
 			source2.icon_old = src.icon

code/game/machinery/computer/security.dm

@@ -507,14 +507,14 @@ What a mess.*/
 							del(active2)
 
 					if ("Delete Record (ALL) Execute")
-						for(var/datum/data/record/R in data_core.medical)
-							if ((R.fields["name"] == active1.fields["name"] || R.fields["id"] == active1.fields["id"]))
-								del(R)
-							else
+						if (active1)
+							for(var/datum/data/record/R in data_core.medical)
+								if ((R.fields["name"] == active1.fields["name"] || R.fields["id"] == active1.fields["id"]))
+									del(R)
+								else
+							del(active1)
 						if (active2)
 							del(active2)
-						if (active1)
-							del(active1)
 					else
 						temp = "This function does not appear to be working at the moment. Our apologies."
 	add_fingerprint(usr)

code/game/objects/items/item.dm

@@ -101,6 +101,10 @@
 			t = "huge"
 		else
 	if ((usr.mutations & CLUMSY) && prob(50)) t = "funny-looking"
+	if(!blood_DNA)
+		var/turf/Z = get_turf(src)
+		world << "\red ERROR: [src] at [Z.x], [Z.y], [Z.z] is missing it's blood_DNA list!  Tell a dev!"
+		return
 	usr << text("This is a []\icon[][]. It is a [] item.", !src.blood_DNA.len ? "" : "bloody ",src, src.name, t)
 	if(src.desc)
 		usr << src.desc