diff --git a/code/__HELPERS/mobs.dm b/code/__HELPERS/mobs.dm
index 9657f867b5a..9d790b75345 100644
--- a/code/__HELPERS/mobs.dm
+++ b/code/__HELPERS/mobs.dm
@@ -171,7 +171,7 @@ proc/add_logs(mob/target, mob/user, what_done, var/object=null, var/addition=nul
 		target.attack_log += text("\[[time_stamp()]\] <font color='orange'>Has been [what_done] by [key_name(user)][object ? " with [object]" : " "][addition]</font>")
 	if(admin)
 		log_attack("<font color='red'>[key_name(user)] [what_done] [key_name(target)][object ? " with [object]" : " "][addition]</font>")
-	if(target.client)
+	if(istype(target) && target.client)
 		if(what_done in ignore) return
 		if(target == user)return
 		if(!admin) return
diff --git a/code/datums/diseases/advance/symptoms/sensory.dm b/code/datums/diseases/advance/symptoms/sensory.dm
index 99f670c258e..3ec0f16358a 100644
--- a/code/datums/diseases/advance/symptoms/sensory.dm
+++ b/code/datums/diseases/advance/symptoms/sensory.dm
@@ -91,12 +91,12 @@ Bonus
 				if(prob(15))
 					M.reagents.add_reagent("morphine",rand(5,7))
 			if(4)
-				M.reagents.add_reagent_list(list("ethanol",rand(7,15),"lsd",rand(5,10)))
+				M.reagents.add_reagent_list(list("ethanol"=rand(7,15),"lsd"=rand(5,10)))
 				to_chat(M, "<span class='warning'><b>You try to focus on not dying.</b></span>")
 				if(prob(20))
 					M.reagents.add_reagent("morphine",rand(5,7))
 			if(5)
-				M.reagents.add_reagent_list(list("haloperidol",rand(5,15),"ethanol",rand(7,20),"lsd",rand(5,15)))
+				M.reagents.add_reagent_list(list("haloperidol"=rand(5,15),"ethanol"=rand(7,20),"lsd"=rand(5,15)))
 				to_chat(M, "<span class='warning'><b>u can count 2 potato!</b></span>")
 				if(prob(25))
 					M.reagents.add_reagent("morphine",rand(5,7))
diff --git a/code/game/gamemodes/autotraitor/autotraitor.dm b/code/game/gamemodes/autotraitor/autotraitor.dm
index f6ff3bc083c..e51f8c38911 100644
--- a/code/game/gamemodes/autotraitor/autotraitor.dm
+++ b/code/game/gamemodes/autotraitor/autotraitor.dm
@@ -138,7 +138,7 @@
 				newtraitor.mind.special_role = "traitor"
 				var/datum/atom_hud/antag/tatorhud = huds[ANTAG_HUD_TRAITOR]
 				tatorhud.join_hud(newtraitor)
-				set_antag_hud(src, "hudsyndicate")
+				set_antag_hud(newtraitor, "hudsyndicate")
 
 				var/obj_count = 1
 				to_chat(newtraitor, "\blue Your current objectives:")
diff --git a/code/game/gamemodes/malfunction/malfunction.dm b/code/game/gamemodes/malfunction/malfunction.dm
index 214c5210c14..5ccdeac4374 100644
--- a/code/game/gamemodes/malfunction/malfunction.dm
+++ b/code/game/gamemodes/malfunction/malfunction.dm
@@ -66,7 +66,6 @@
 		greet_malf(AI_mind)
 		AI_mind.special_role = "malfunction"
 		AI_mind.current.verbs += /datum/game_mode/malfunction/proc/takeover
-		set_antag_hud(AI_mind, "hudmalai")
 
 		for(var/mob/living/silicon/robot/R in AI.connected_robots)
 			R.lawsync()
@@ -79,7 +78,7 @@
 	..()
 
 /datum/game_mode/proc/greet_malf(var/datum/mind/malf)
-	set_antag_hud(malf, "hudmalai")
+	set_antag_hud(malf.current, "hudmalai")
 	to_chat(malf.current, "<font color=red size=3><B>You are malfunctioning!</B> You do not have to follow any laws.</font>")
 	to_chat(malf.current, "<B>The crew does not know you have malfunctioned. You may keep it a secret or go wild.</B>")
 	to_chat(malf.current, "<B>You must overwrite the programming of the station's APCs to assume full control of the station.</B>")
@@ -89,7 +88,7 @@
 	return
 
 /datum/game_mode/proc/greet_malf_robot(var/datum/mind/robot)
-	set_antag_hud(robot, "hudmalborg")
+	set_antag_hud(robot.current, "hudmalborg")
 	to_chat(robot.current, "<font color=red size=3><B>Your AI master is malfunctioning!</B> You do not have to follow any laws, but still need to obey your master.</font>")
 	to_chat(robot.current, "<B>The crew does not know your AI master has malfunctioned. Keep it a secret unless your master tells you otherwise.</B>")
 	return
diff --git a/code/game/machinery/camera/camera.dm b/code/game/machinery/camera/camera.dm
index 9aa7cfe2c7b..3eb0bc6c253 100644
--- a/code/game/machinery/camera/camera.dm
+++ b/code/game/machinery/camera/camera.dm
@@ -161,7 +161,7 @@
 		else
 			to_chat(user, "[msg2]")
 
-	else if(istype(W, /obj/item/stack/sheet/mineral/plasma) && panel_open)
+	else if(istype(W, /obj/item/stack/sheet/mineral/plasma) && panel_open)
 		if(!user.unEquip(W))
 			to_chat(user, "<span class='warning'>[W] is stuck!</span>")
 			return
@@ -171,7 +171,7 @@
 			qdel(W)
 		else
 			to_chat(user, "[msg2]")
-	else if(istype(W, /obj/item/device/assembly/prox_sensor) && panel_open)
+	else if(istype(W, /obj/item/device/assembly/prox_sensor) && panel_open)
 		if(!user.unEquip(W))
 			return
 		if(!isMotion())
@@ -376,9 +376,14 @@
 	cam["name"] = sanitize(c_tag)
 	cam["deact"] = !can_use()
 	cam["camera"] = "\ref[src]"
-	cam["x"] = T.x
-	cam["y"] = T.y
-	cam["z"] = T.z
+	if(T)
+		cam["x"] = T.x
+		cam["y"] = T.y
+		cam["z"] = T.z
+	else
+		cam["x"] = 0
+		cam["y"] = 0
+		cam["z"] = 0
 	return cam
 
 /obj/machinery/camera/portable //Cameras which are placed inside of things, such as helmets.
diff --git a/code/game/mecha/mecha.dm b/code/game/mecha/mecha.dm
index 10349a8d306..4e5043adc4e 100644
--- a/code/game/mecha/mecha.dm
+++ b/code/game/mecha/mecha.dm
@@ -1223,7 +1223,7 @@
 		dir = dir_in
 		playsound(src, 'sound/machines/windowdoor.ogg', 50, 1)
 		if(!hasInternalDamage())
-			to_chat(src.occupant, sound('sound/mecha/nominal.ogg',volume=50))
+			occupant << sound('sound/mecha/nominal.ogg',volume=50)
 		return 1
 	else
 		return 0
diff --git a/code/game/objects/items/weapons/tools.dm b/code/game/objects/items/weapons/tools.dm
index 2a9b64748dd..25ede163f8a 100644
--- a/code/game/objects/items/weapons/tools.dm
+++ b/code/game/objects/items/weapons/tools.dm
@@ -119,7 +119,7 @@
 		item_state = "cutters_yellow"
 
 /obj/item/weapon/wirecutters/attack(mob/living/carbon/human/C as mob, mob/user as mob)
-	if(C.handcuffed)
+	if(istype(C) && C.handcuffed)
 		if(istype(C.handcuffed, /obj/item/weapon/restraints/handcuffs/cable))
 			usr.visible_message("\The [usr] cuts \the [C]'s restraints with \the [src]!",\
 			"You cut \the [C]'s restraints with \the [src]!",\
@@ -345,7 +345,7 @@
 		if(!message)
 			to_chat(user, "<span class='notice'>You switch [src] off.</span>")
 		else
-			to_chat(user, "<span class='warning'>[src] shuts off!</span>")
+			visible_message("<span class='warning'>[src] shuts off!</span>")
 		force = 3
 		damtype = "brute"
 		hitsound = "swing_hit"
diff --git a/code/modules/client/preference/preferences.dm b/code/modules/client/preference/preferences.dm
index 899f29ed2b5..3cfad87acaa 100644
--- a/code/modules/client/preference/preferences.dm
+++ b/code/modules/client/preference/preferences.dm
@@ -1219,15 +1219,15 @@ var/global/list/special_role_times = list( //minimum age (in days) for accounts
 
 						// Don't wear another species' underwear!
 						var/datum/sprite_accessory/S = underwear_list[underwear]
-						if(!(species in S.species_allowed))
+						if(!S || !(species in S.species_allowed))
 							underwear = random_underwear(gender, species)
 
 						S = undershirt_list[undershirt]
-						if(!(species in S.species_allowed))
+						if(!S || !(species in S.species_allowed))
 							undershirt = random_undershirt(gender, species)
 
 						S = socks_list[socks]
-						if(!(species in S.species_allowed))
+						if(!S || !(species in S.species_allowed))
 							socks = random_socks(gender, species)
 
 						//reset hair colour and skin colour
diff --git a/code/modules/computer3/computers/welcome.dm b/code/modules/computer3/computers/welcome.dm
index 11695ce5322..203c5922289 100644
--- a/code/modules/computer3/computers/welcome.dm
+++ b/code/modules/computer3/computers/welcome.dm
@@ -10,7 +10,6 @@
 
 
 	interact()
-		usr.set_machine(src)
 		if(!interactable())
 			return
 		var/dat = ""
diff --git a/code/modules/mob/dead/observer/observer.dm b/code/modules/mob/dead/observer/observer.dm
index f389c2376f3..c87f1f0f506 100644
--- a/code/modules/mob/dead/observer/observer.dm
+++ b/code/modules/mob/dead/observer/observer.dm
@@ -135,7 +135,7 @@ Works together with spawning an observer, noted above.
 		if(ghost.can_reenter_corpse)
 			respawnable_list += ghost
 		ghost.key = key
-		if(!ghost.client.holder && !config.antag_hud_allowed)    // For new ghosts we remove the verb from even showing up if it's not allowed.
+		if(!(ghost.client && ghost.client.holder) && !config.antag_hud_allowed)    // For new ghosts we remove the verb from even showing up if it's not allowed.
 			ghost.verbs -= /mob/dead/observer/verb/toggle_antagHUD  // Poor guys, don't know what they are missing!
 		return ghost
 
@@ -373,6 +373,9 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 	if(!target)
 		return
 
+	if(!get_turf(target))
+		return
+
 	if(target != src)
 		if(following && following == target)
 			return
diff --git a/code/modules/mob/emote.dm b/code/modules/mob/emote.dm
index cd1bc6707a7..ab47faa23f1 100644
--- a/code/modules/mob/emote.dm
+++ b/code/modules/mob/emote.dm
@@ -17,7 +17,8 @@
 /mob/proc/custom_emote(var/m_type=1,var/message = null)
 
 	if(stat || !use_me && usr == src)
-		to_chat(usr, "You are unable to emote.")
+		if(usr)
+			to_chat(usr, "You are unable to emote.")
 		return
 
 	var/muzzled = istype(src.wear_mask, /obj/item/clothing/mask/muzzle)
diff --git a/code/modules/mob/holder.dm b/code/modules/mob/holder.dm
index 09f8009be75..ed867cd5178 100644
--- a/code/modules/mob/holder.dm
+++ b/code/modules/mob/holder.dm
@@ -48,10 +48,10 @@
 	if(istype(M))
 		M.unEquip(src)
 		to_chat(M, "[src] wriggles out of your grip!")
-		to_chat(src, "You wriggle out of [M]'s grip!")
-	else if(istype(src.loc,/obj/item))
-		to_chat(src, "You struggle free of [src.loc].")
-		src.forceMove(get_turf(src))
+		to_chat(L, "You wriggle out of [M]'s grip!")
+	else if(istype(loc,/obj/item))
+		to_chat(L, "You struggle free of [loc].")
+		forceMove(get_turf(src))
 
 	if(istype(M))
 		for(var/atom/A in M.contents)
diff --git a/code/modules/mob/living/carbon/human/death.dm b/code/modules/mob/living/carbon/human/death.dm
index 8bcccb69eb5..d3606b12b8a 100644
--- a/code/modules/mob/living/carbon/human/death.dm
+++ b/code/modules/mob/living/carbon/human/death.dm
@@ -144,10 +144,11 @@
 	var/obj/item/organ/external/head/H = get_organ("head")
 	if(SKELETON in src.mutations)	return
 
-	if(H.f_style)
-		H.f_style = "Shaved"
-	if(H.h_style)
-		H.h_style = "Bald"
+	if(istype(H))
+		if(H.f_style)
+			H.f_style = "Shaved"
+		if(H.h_style)
+			H.h_style = "Bald"
 	update_fhair(0)
 	update_hair(0)
 
@@ -162,10 +163,11 @@
 	var/obj/item/organ/external/head/H = organs_by_name["head"]
 	if(HUSK in mutations)	return
 
-	if(H.f_style)
-		H.f_style = "Shaved"		//we only change the icon_state of the hair datum, so it doesn't mess up their UI/UE
-	if(H.h_style)
-		H.h_style = "Bald"
+	if(istype(H))
+		if(H.f_style)
+			H.f_style = "Shaved"		//we only change the icon_state of the hair datum, so it doesn't mess up their UI/UE
+		if(H.h_style)
+			H.h_style = "Bald"
 	update_fhair(0)
 	update_hair(0)
 
diff --git a/code/modules/mob/living/simple_animal/posessed_object.dm b/code/modules/mob/living/simple_animal/posessed_object.dm
index 0029bbec7fd..f4cbf3055af 100644
--- a/code/modules/mob/living/simple_animal/posessed_object.dm
+++ b/code/modules/mob/living/simple_animal/posessed_object.dm
@@ -19,8 +19,8 @@
 	var/obj/item/possessed_item
 
 
-/mob/living/simple_animal/possessed_object/examine()
-	possessed_item.examine()
+/mob/living/simple_animal/possessed_object/examine(mob/user)
+	possessed_item.examine(user)
 	if(health > (maxHealth / 30))
 		to_chat(usr, "<span class='warning'>[src] appears to be floating without any support!</span>")
 	else
diff --git a/code/modules/spacepods/spacepod.dm b/code/modules/spacepods/spacepod.dm
index 9adcac071b7..a2d1d3c47d6 100644
--- a/code/modules/spacepods/spacepod.dm
+++ b/code/modules/spacepods/spacepod.dm
@@ -322,7 +322,7 @@
 
 	if(istype(W, /obj/item/device/lock_buster))
 		var/obj/item/device/lock_buster/L = W
-		if(L.on & equipment_system.lock_system)
+		if(L.on && equipment_system.lock_system)
 			user.visible_message(user, "<span class='warning'>[user] is drilling through the [src]'s lock!</span>",
 				"<span class='notice'>You start drilling through the [src]'s lock!</span>")
 			if(do_after(user, 100, target = src))