diff --git a/code/ATMOSPHERICS/atmospherics.dm b/code/ATMOSPHERICS/atmospherics.dm
index 1d7f436770d..6f1be49b3b7 100644
--- a/code/ATMOSPHERICS/atmospherics.dm
+++ b/code/ATMOSPHERICS/atmospherics.dm
@@ -259,8 +259,7 @@ Pipelines + Other Objects -> Pipe network
 				user.last_played_vent = world.time
 				playsound(src, 'sound/machines/ventcrawl.ogg', 50, 1, -3)
 	else
-		var/can_connect = check_connect_types(target_move, src)
-		if((direction & initialize_directions) || (is_type_in_list(src, ventcrawl_machinery) && target_move.can_crawl_through() && can_connect)) //if we move in a way the pipe can connect, but doesn't - or we're in a vent
+		if((direction & initialize_directions) || is_type_in_list(src, ventcrawl_machinery)) //if we move in a way the pipe can connect, but doesn't - or we're in a vent
 			user.remove_ventcrawl()
 			user.forceMove(src.loc)
 			user.visible_message("You hear something squeezing through the pipes.", "You climb out the ventilation system.")
diff --git a/code/game/dna/dna2_helpers.dm b/code/game/dna/dna2_helpers.dm
index 60654ee4f85..8a0894bfe09 100644
--- a/code/game/dna/dna2_helpers.dm
+++ b/code/game/dna/dna2_helpers.dm
@@ -134,8 +134,10 @@
 		var/obj/item/organ/external/head/head_organ = H.get_organ("head")
 		var/obj/item/organ/internal/eyes/eye_organ = H.get_int_organ(/obj/item/organ/internal/eyes)
 		var/datum/species/S = H.species
-		dna.write_head_attributes(head_organ)
-		dna.write_eyes_attributes(eye_organ)
+		if(istype(head_organ))
+			dna.write_head_attributes(head_organ)
+		if(istype(eye_organ))
+			dna.write_eyes_attributes(eye_organ)
 		H.update_eyes()
 
 		H.r_skin		= dna.GetUIValueRange(DNA_UI_SKIN_R,	255)
diff --git a/code/game/objects/effects/decals/Cleanable/tracks.dm b/code/game/objects/effects/decals/Cleanable/tracks.dm
index 20dee798e8d..2e0c30e00af 100644
--- a/code/game/objects/effects/decals/Cleanable/tracks.dm
+++ b/code/game/objects/effects/decals/Cleanable/tracks.dm
@@ -101,4 +101,25 @@ var/global/list/image/fluidtrack_cache=list()
 				I.color = basecolor
 				overlays += I
 
-	alpha = BLOODY_FOOTPRINT_BASE_ALPHA+bloodiness
\ No newline at end of file
+	alpha = BLOODY_FOOTPRINT_BASE_ALPHA+bloodiness
+
+/proc/createFootprintsFrom(atom/movable/A, dir, turf/T)
+	var/obj/effect/decal/cleanable/blood/footprints/FP = new /obj/effect/decal/cleanable/blood/footprints(T)
+	if(ishuman(A))
+		var/mob/living/carbon/human/H = A
+		FP.blood_state = H.blood_state
+		FP.bloodiness = H.bloody_feet[H.blood_state]
+		FP.basecolor = H.feet_blood_color
+		if(H.blood_DNA)
+			FP.blood_DNA = H.blood_DNA.Copy()
+	else if(istype(A, /obj/item/clothing/shoes))
+		var/obj/item/clothing/shoes/S = A
+		FP.blood_state = S.blood_state
+		FP.bloodiness = S.bloody_shoes[S.blood_state]
+		FP.basecolor = S.blood_color
+		if(S.blood_DNA)
+			FP.blood_DNA = S.blood_DNA.Copy()
+	FP.entered_dirs |= dir
+	FP.update_icon()
+
+	return FP
diff --git a/code/game/objects/items/weapons/storage/storage.dm b/code/game/objects/items/weapons/storage/storage.dm
index 5931696b599..f08fc81aaa5 100644
--- a/code/game/objects/items/weapons/storage/storage.dm
+++ b/code/game/objects/items/weapons/storage/storage.dm
@@ -568,6 +568,8 @@
 	for(var/thing in data["content"])
 		if(islist(thing))
 			list_to_object(thing, src)
+		else if(thing == null)
+			log_runtime(EXCEPTION("Null entry found in storage/deserialize."), src)
 		else
 			log_runtime(EXCEPTION("Non-list thing found in storage/deserialize."), src, list("Thing: [thing]"))
 	..()
diff --git a/code/modules/mob/living/carbon/brain/posibrain.dm b/code/modules/mob/living/carbon/brain/posibrain.dm
index 54d8a680ae7..037a3f520b3 100644
--- a/code/modules/mob/living/carbon/brain/posibrain.dm
+++ b/code/modules/mob/living/carbon/brain/posibrain.dm
@@ -25,12 +25,14 @@
 		to_chat(user, "<span class='notice'>You carefully locate the manual activation switch and start the positronic brain's boot process.</span>")
 		icon_state = "posibrain-searching"
 		ghost_volunteers.Cut()
-		src.searching = 1
-		src.request_player()
+		searching = 1
+		request_player()
 		spawn(600)
 			if(ghost_volunteers.len)
-				var/mob/dead/observer/O = pick(ghost_volunteers)
-				if(check_observer(O))
+				var/mob/dead/observer/O
+				while(!istype(O) && ghost_volunteers.len)
+					O = pick_n_take(ghost_volunteers)
+				if(istype(O) && check_observer(O))
 					transfer_personality(O)
 			reset_search()
 	else
diff --git a/code/modules/mob/living/carbon/human/human_movement.dm b/code/modules/mob/living/carbon/human/human_movement.dm
index 164eb14e7cd..34fe45df29c 100644
--- a/code/modules/mob/living/carbon/human/human_movement.dm
+++ b/code/modules/mob/living/carbon/human/human_movement.dm
@@ -56,13 +56,7 @@
 					else
 						//No oldFP or it's a different kind of blood
 						S.bloody_shoes[S.blood_state] = max(0, S.bloody_shoes[S.blood_state] - BLOOD_LOSS_PER_STEP)
-						var/obj/effect/decal/cleanable/blood/footprints/FP = new /obj/effect/decal/cleanable/blood/footprints(T)
-						FP.blood_state = S.blood_state
-						FP.entered_dirs |= dir
-						FP.bloodiness = S.bloody_shoes[S.blood_state]
-						FP.blood_DNA = S.blood_DNA
-						FP.basecolor = S.blood_color
-						FP.update_icon()
+						createFootprintsFrom(shoes, dir, T)
 						update_inv_shoes()
 			else if(hasfeet)
 				if(bloody_feet && bloody_feet[blood_state])
@@ -71,12 +65,7 @@
 						return
 					else
 						bloody_feet[blood_state] = max(0, bloody_feet[blood_state] - BLOOD_LOSS_PER_STEP)
-						var/obj/effect/decal/cleanable/blood/footprints/FP = new /obj/effect/decal/cleanable/blood/footprints(T)
-						FP.blood_state = blood_state
-						FP.entered_dirs |= dir
-						FP.bloodiness = bloody_feet[blood_state]
-						FP.basecolor = feet_blood_color
-						FP.update_icon()
+						createFootprintsFrom(src, dir, T)
 						update_inv_shoes()
 			//End bloody footprints
 			if(S)
diff --git a/code/modules/pda/PDA.dm b/code/modules/pda/PDA.dm
index 9b0413b94ee..e002049e55f 100755
--- a/code/modules/pda/PDA.dm
+++ b/code/modules/pda/PDA.dm
@@ -376,7 +376,7 @@ var/global/list/obj/item/device/pda/PDAs = list()
 /obj/item/device/pda/proc/id_check(mob/user as mob, choice as num)//To check for IDs; 1 for in-pda use, 2 for out of pda use.
 	if(choice == 1)
 		if(id)
-			remove_id()
+			remove_id(user)
 		else
 			var/obj/item/I = user.get_active_hand()
 			if(istype(I, /obj/item/weapon/card/id))
diff --git a/code/modules/pda/cart_apps.dm b/code/modules/pda/cart_apps.dm
index 30f732f48ae..0ccef76ec7c 100644
--- a/code/modules/pda/cart_apps.dm
+++ b/code/modules/pda/cart_apps.dm
@@ -103,7 +103,7 @@
 			"poweravail" = powmonitor.powernet.avail,
 			"powerload" = num2text(powmonitor.powernet.viewload, 10),
 			"powerdemand" = powmonitor.powernet.load,
-			"apcs" = apc_repository.apc_data(powmonitor))
+			"apcs" = apc_repository.apc_data(powmonitor.powernet))
 		has_back = 1
 	else
 		data["records"] = list(
diff --git a/code/modules/reagents/chemistry/reagents/water.dm b/code/modules/reagents/chemistry/reagents/water.dm
index 52de625fe04..0122fa1d249 100644
--- a/code/modules/reagents/chemistry/reagents/water.dm
+++ b/code/modules/reagents/chemistry/reagents/water.dm
@@ -472,4 +472,4 @@
 	if(istype(O, /obj/item/clothing/shoes/galoshes))
 		var/t_loc = get_turf(O)
 		qdel(O)
-		new /obj/item/clothing/shoes/galoshes/dry(t_loc)
\ No newline at end of file
+		new /obj/item/clothing/shoes/galoshes/dry(t_loc)
diff --git a/code/modules/space_management/level_check.dm b/code/modules/space_management/level_check.dm
index 391f5968c22..a9abdaa5472 100644
--- a/code/modules/space_management/level_check.dm
+++ b/code/modules/space_management/level_check.dm
@@ -4,4 +4,4 @@
 
 // For expansion later
 /proc/atoms_share_level(atom/A, atom/B)
-  return A.z == B.z
+  return A && B && A.z == B.z
diff --git a/code/modules/surgery/organs/organ.dm b/code/modules/surgery/organs/organ.dm
index a4fdfa5bc6c..134089d9d41 100644
--- a/code/modules/surgery/organs/organ.dm
+++ b/code/modules/surgery/organs/organ.dm
@@ -170,6 +170,9 @@ var/list/organ_cache = list()
 		if(antibiotics < 5 && parent.germ_level < germ_level && ( parent.germ_level < INFECTION_LEVEL_ONE*2 || prob(30) ))
 			parent.germ_level++
 
+/obj/item/organ/internal/handle_germ_effects()
+	..()
+	if(germ_level >= INFECTION_LEVEL_TWO)
 		if(prob(3))	//about once every 30 seconds
 			take_damage(1,silent=prob(30))