diff --git a/code/_onclick/hud/parallax.dm b/code/_onclick/hud/parallax.dm
index 8592383a4f..25a49c8d6b 100755
--- a/code/_onclick/hud/parallax.dm
+++ b/code/_onclick/hud/parallax.dm
@@ -146,6 +146,8 @@
 
 
 /datum/hud/proc/update_parallax_motionblur(client/C, animatedir, new_parallax_movedir, matrix/newtransform)
+	if(!C)
+		return
 	C.parallax_animate_timer = FALSE
 	for(var/thing in C.parallax_layers)
 		var/obj/screen/parallax_layer/L = thing
@@ -167,7 +169,7 @@
 /datum/hud/proc/update_parallax()
 	var/client/C = mymob.client
 	var/turf/posobj = get_turf(C.eye)
-	if(!posobj) 
+	if(!posobj)
 		return
 	var/area/areaobj = posobj.loc
 
diff --git a/code/game/objects/effects/effect_system/effect_system.dm b/code/game/objects/effects/effect_system/effect_system.dm
index ddc805f3ff..05077bf898 100644
--- a/code/game/objects/effects/effect_system/effect_system.dm
+++ b/code/game/objects/effects/effect_system/effect_system.dm
@@ -48,6 +48,8 @@ would spawn and follow the beaker, even if it is carried or thrown.
 	holder = atom
 
 /datum/effect_system/proc/start()
+	if(QDELETED(src))
+		return
 	for(var/i in 1 to number)
 		if(total_effects > 20)
 			return
@@ -69,7 +71,8 @@ would spawn and follow the beaker, even if it is carried or thrown.
 	for(var/j in 1 to steps_amt)
 		sleep(5)
 		step(E,direction)
-	addtimer(CALLBACK(src, .proc/decrement_total_effect), 20)
+	if(!QDELETED(src))
+		addtimer(CALLBACK(src, .proc/decrement_total_effect), 20)
 
 /datum/effect_system/proc/decrement_total_effect()
 	total_effects--
diff --git a/code/game/objects/structures/guillotine.dm b/code/game/objects/structures/guillotine.dm
index 3b4bbea559..611a6d024d 100644
--- a/code/game/objects/structures/guillotine.dm
+++ b/code/game/objects/structures/guillotine.dm
@@ -97,7 +97,7 @@
 	icon_state = "guillotine_raised"
 
 /obj/structure/guillotine/proc/drop_blade(mob/user)
-	if (buckled_mobs.len && blade_sharpness)
+	if (has_buckled_mobs() && blade_sharpness)
 		var/mob/living/carbon/human/H = buckled_mobs[1]
 
 		if (!H)
diff --git a/code/modules/atmospherics/machinery/components/components_base.dm b/code/modules/atmospherics/machinery/components/components_base.dm
index ff2a655aac..86e8863b2b 100644
--- a/code/modules/atmospherics/machinery/components/components_base.dm
+++ b/code/modules/atmospherics/machinery/components/components_base.dm
@@ -30,7 +30,7 @@
 	underlays.Cut()
 
 	var/turf/T = loc
-	if(level == 2 || !T.intact)
+	if(level == 2 || (istype(T) && !T.intact))
 		showpipe = TRUE
 		plane = GAME_PLANE
 	else
diff --git a/code/modules/mob/living/carbon/human/human_defense.dm b/code/modules/mob/living/carbon/human/human_defense.dm
index 934e0f08dc..accaab3ac1 100644
--- a/code/modules/mob/living/carbon/human/human_defense.dm
+++ b/code/modules/mob/living/carbon/human/human_defense.dm
@@ -336,7 +336,8 @@
 			if(bomb_armor < EXPLODE_GIB_THRESHOLD) //gibs the mob if their bomb armor is lower than EXPLODE_GIB_THRESHOLD
 				for(var/I in contents)
 					var/atom/A = I
-					A.ex_act(severity)
+					if(!QDELETED(A))
+						A.ex_act(severity)
 				gib()
 				return
 			else
diff --git a/code/modules/mob/living/simple_animal/friendly/dog.dm b/code/modules/mob/living/simple_animal/friendly/dog.dm
index 2371cfd7f1..554d03991a 100644
--- a/code/modules/mob/living/simple_animal/friendly/dog.dm
+++ b/code/modules/mob/living/simple_animal/friendly/dog.dm
@@ -207,7 +207,11 @@
 
 		switch(add_to)
 			if("collar")
-				add_collar(usr.get_active_held_item(), usr)
+				var/obj/item/clothing/neck/petcollar/P = usr.get_active_held_item()
+				if(!istype(P))
+					to_chat(usr,"<span class='warning'>That's not a collar.</span>")
+					return
+				add_collar(P, usr)
 				update_corgi_fluff()
 
 			if(BODY_ZONE_HEAD)
diff --git a/code/modules/modular_computers/computers/item/computer_damage.dm b/code/modules/modular_computers/computers/item/computer_damage.dm
index 001cf3aa65..6664b449bd 100644
--- a/code/modules/modular_computers/computers/item/computer_damage.dm
+++ b/code/modules/modular_computers/computers/item/computer_damage.dm
@@ -23,6 +23,8 @@
 		new /obj/item/stack/sheet/metal(newloc, round(steel_sheet_cost/2))
 		for(var/C in all_components)
 			var/obj/item/computer_hardware/H = all_components[C]
+			if(QDELETED(H))
+				return
 			uninstall_component(H)
 			H.forceMove(newloc)
 			if(prob(25))
diff --git a/code/modules/research/experimentor.dm b/code/modules/research/experimentor.dm
index 681195bcc3..fd68a393f9 100644
--- a/code/modules/research/experimentor.dm
+++ b/code/modules/research/experimentor.dm
@@ -573,7 +573,8 @@
 		else if(loc == user)
 			cooldown = TRUE
 			call(src,realProc)(user)
-			addtimer(CALLBACK(src, .proc/cd), cooldownMax)
+			if(!QDELETED(src))
+				addtimer(CALLBACK(src, .proc/cd), cooldownMax)
 	else
 		to_chat(user, "<span class='notice'>You aren't quite sure what to do with this yet.</span>")