diff --git a/code/game/machinery/doors/airlock_types.dm b/code/game/machinery/doors/airlock_types.dm
index 3525742c..3968e3ef 100644
--- a/code/game/machinery/doors/airlock_types.dm
+++ b/code/game/machinery/doors/airlock_types.dm
@@ -500,7 +500,7 @@
 			SEND_SOUND(L, sound(pick('sound/hallucinations/turn_around1.ogg','sound/hallucinations/turn_around2.ogg'),0,1,50))
 			flash_color(L, flash_color="#960000", flash_time=20)
 			L.Knockdown(40)
-			L.throw_at(throwtarget, 5, 1,src)
+			L.throw_at(throwtarget, 5, 1)
 		return 0
 
 /obj/machinery/door/airlock/cult/proc/conceal()
diff --git a/code/game/objects/items/miscellaneous.dm b/code/game/objects/items/miscellaneous.dm
index 8983485c..d3047c03 100644
--- a/code/game/objects/items/miscellaneous.dm
+++ b/code/game/objects/items/miscellaneous.dm
@@ -47,7 +47,7 @@
 		if(istype(H.ears, /obj/item/radio/headset))
 			msg = "You hear something crackle in your ears for a moment before a voice speaks.  \"Please stand by for a message from Central Command.  Message as follows: <span class='bold'>Item request received. Your package is inbound, please stand back from the landing site.</span> Message ends.\""
 	to_chat(M, msg)
-	new /obj/effect/DPtarget(get_turf(src), pod)
+	new /obj/effect/abstract/DPtarget(get_turf(src), pod)
 
 /obj/item/caution
 	desc = "Caution! Wet Floor!"
diff --git a/code/game/turfs/simulated/lava.dm b/code/game/turfs/simulated/lava.dm
index ce98b16e..efdf8c13 100644
--- a/code/game/turfs/simulated/lava.dm
+++ b/code/game/turfs/simulated/lava.dm
@@ -109,7 +109,7 @@
 				O.resistance_flags |= FLAMMABLE //Even fireproof things burn up in lava
 			if(O.resistance_flags & FIRE_PROOF)
 				O.resistance_flags &= ~FIRE_PROOF
-			if(O.armor.fire > 50) //obj with 100% fire armor still get slowly burned away.
+			if(O.armor?.fire > 50) //obj with 100% fire armor still get slowly burned away.
 				O.armor = O.armor.setRating(fire = 50)
 			O.fire_act(10000, 1000)
 
diff --git a/code/modules/flufftext/Hallucination.dm b/code/modules/flufftext/Hallucination.dm
index 48c87cae..f229c0ce 100644
--- a/code/modules/flufftext/Hallucination.dm
+++ b/code/modules/flufftext/Hallucination.dm
@@ -237,10 +237,10 @@ GLOBAL_LIST_INIT(hallucination_list, list(
 		xeno = new(pump.loc,target)
 		sleep(10)
 		xeno.update_icon("alienh_leap",'icons/mob/alienleap.dmi',-32,-32)
-		xeno.throw_at(target,7,1, xeno, FALSE, TRUE)
+		xeno.throw_at(target,7,1, null, FALSE, TRUE)
 		sleep(10)
 		xeno.update_icon("alienh_leap",'icons/mob/alienleap.dmi',-32,-32)
-		xeno.throw_at(pump,7,1, xeno, FALSE, TRUE)
+		xeno.throw_at(pump,7,1, null, FALSE, TRUE)
 		sleep(10)
 		var/xeno_name = xeno.name
 		to_chat(target, "<span class='notice'>[xeno_name] begins climbing into the ventilation system...</span>")
diff --git a/code/modules/integrated_electronics/subtypes/manipulation.dm b/code/modules/integrated_electronics/subtypes/manipulation.dm
index f4456eaf..12f5791c 100644
--- a/code/modules/integrated_electronics/subtypes/manipulation.dm
+++ b/code/modules/integrated_electronics/subtypes/manipulation.dm
@@ -339,7 +339,7 @@
 	assembly.visible_message("<span class='danger'>[assembly] has thrown [A]!</span>")
 	log_attack("[assembly] [REF(assembly)] has thrown [A] with non-lethal force.")
 	A.forceMove(drop_location())
-	A.throw_at(locate(x_abs, y_abs, T.z), range, 3, , , , CALLBACK(src, .proc/post_throw, A))
+	A.throw_at(locate(x_abs, y_abs, T.z), range, 3, null, null, null, CALLBACK(src, .proc/post_throw, A))
 
 	// If the item came from a grabber now we can update the outputs since we've thrown it.
 	if(istype(G))
diff --git a/code/modules/mob/mob_helpers.dm b/code/modules/mob/mob_helpers.dm
index 76732918..91f68cd3 100644
--- a/code/modules/mob/mob_helpers.dm
+++ b/code/modules/mob/mob_helpers.dm
@@ -514,10 +514,10 @@ It's fairly easy to fix if dealing with single letters but not so much with comp
 //gets ID card object from special clothes slot or null.
 /mob/proc/get_idcard(hand_first = TRUE)
 	var/obj/item/held_item = get_active_held_item()
-	. = held_item?.GetID()
+	. = held_item ? held_item.GetID() : null
 	if(!.) //If so, then check the inactive hand
 		held_item = get_inactive_held_item()
-		. = held_item?.GetID()
+		. = held_item ? held_item.GetID() : null
 
 /mob/proc/get_id_in_hand()
 	var/obj/item/held_item = get_active_held_item()
diff --git a/code/modules/mob/mob_transformation_simple.dm b/code/modules/mob/mob_transformation_simple.dm
index 673548ff..8c9eb076 100644
--- a/code/modules/mob/mob_transformation_simple.dm
+++ b/code/modules/mob/mob_transformation_simple.dm
@@ -47,7 +47,7 @@
 		D.updateappearance(mutcolor_update=1, mutations_overlay_update=1)
 	else if(ishuman(M))
 		var/mob/living/carbon/human/H = M
-		client.prefs.copy_to(H)
+		client?.prefs.copy_to(H)
 		H.dna.update_dna_identity()
 
 	if(mind && isliving(M))
diff --git a/code/modules/modular_computers/computers/item/processor.dm b/code/modules/modular_computers/computers/item/processor.dm
index 99d648d0..b4ed0b1e 100644
--- a/code/modules/modular_computers/computers/item/processor.dm
+++ b/code/modules/modular_computers/computers/item/processor.dm
@@ -17,7 +17,7 @@
 	machinery_computer = null
 
 /obj/item/modular_computer/processor/New(comp)
-	STOP_PROCESSING(SSobj, src) // Processed by its machine
+	. = ..()
 
 	if(!comp || !istype(comp, /obj/machinery/modular_computer))
 		CRASH("Inapropriate type passed to obj/item/modular_computer/processor/New()! Aborting.")
@@ -73,4 +73,4 @@
 		if(MC_SDD)
 			machinery_computer.verbs -= /obj/machinery/modular_computer/proc/eject_disk
 		if(MC_AI)
-			machinery_computer.verbs -= /obj/machinery/modular_computer/proc/eject_card
\ No newline at end of file
+			machinery_computer.verbs -= /obj/machinery/modular_computer/proc/eject_card
diff --git a/code/modules/projectiles/projectile.dm b/code/modules/projectiles/projectile.dm
index 2aca847e..4ab19515 100644
--- a/code/modules/projectiles/projectile.dm
+++ b/code/modules/projectiles/projectile.dm
@@ -223,8 +223,8 @@
 	beam_segments[beam_index] = null
 
 /obj/item/projectile/Bump(atom/A)
-	var/datum/point/pcache = trajectory.copy_to()
-	if(check_ricochet(A) && check_ricochet_flag(A) && ricochets < ricochets_max)
+	if(trajectory && check_ricochet(A) && check_ricochet_flag(A) && ricochets < ricochets_max)
+		var/datum/point/pcache = trajectory.copy_to()
 		ricochets++
 		if(A.handle_ricochet(src))
 			on_ricochet(A)
diff --git a/code/modules/research/machinery/_production.dm b/code/modules/research/machinery/_production.dm
index 0978986f..48df9a27 100644
--- a/code/modules/research/machinery/_production.dm
+++ b/code/modules/research/machinery/_production.dm
@@ -84,8 +84,9 @@
 		investigate_log("[key_name(user)] built [amount] of [path] at [src]([type]).", INVESTIGATE_RESEARCH)
 		message_admins("[ADMIN_LOOKUPFLW(user)] has built [amount] of [path] at a [src]([type]).")
 	for(var/i in 1 to amount)
-		var/obj/item/I = new path(get_turf(src))
-		if(efficient_with(I.type))
+		var/obj/O = new path(get_turf(src))
+		if(efficient_with(O.type) && isitem(O))
+			var/obj/item/I = O
 			I.materials = matlist.Copy()
 	SSblackbox.record_feedback("nested tally", "item_printed", amount, list("[type]", "[path]"))
 
diff --git a/code/modules/shuttle/special.dm b/code/modules/shuttle/special.dm
index 4ee94c05..26a49bf6 100644
--- a/code/modules/shuttle/special.dm
+++ b/code/modules/shuttle/special.dm
@@ -187,7 +187,7 @@
 		var/mob/living/M = AM
 		var/throwtarget = get_edge_target_turf(src, boot_dir)
 		M.Knockdown(40)
-		M.throw_at(throwtarget, 5, 1,src)
+		M.throw_at(throwtarget, 5, 1)
 		to_chat(M, "<span class='notice'>No climbing on the bar please.</span>")
 	else
 		. = ..()
diff --git a/code/modules/surgery/organs/eyes.dm b/code/modules/surgery/organs/eyes.dm
index 69057c60..fe0595de 100644
--- a/code/modules/surgery/organs/eyes.dm
+++ b/code/modules/surgery/organs/eyes.dm
@@ -227,7 +227,7 @@
 	terminate_effects()
 	. = ..()
 
-/obj/item/organ/eyes/robotic/glow/Remove()
+/obj/item/organ/eyes/robotic/glow/Remove(mob/living/carbon/M, special = FALSE)
 	terminate_effects()
 	. = ..()
 
@@ -338,7 +338,7 @@
 /obj/item/organ/eyes/robotic/glow/proc/start_visuals()
 	if(!islist(eye_lighting))
 		regenerate_light_effects()
-	if((eye_lighting.len < light_beam_distance) || !on_mob)
+	if((LAZYLEN(eye_lighting) < light_beam_distance) || !on_mob)
 		regenerate_light_effects()
 	sync_light_effects()
 	update_visuals()
@@ -377,4 +377,4 @@
 
 /obj/item/organ/eyes/ipc
 	name = "ipc eyes"
-	icon_state = "cybernetic_eyeballs"
\ No newline at end of file
+	icon_state = "cybernetic_eyeballs"
diff --git a/code/modules/surgery/organs/organ_internal.dm b/code/modules/surgery/organs/organ_internal.dm
index fc205f60..cf224f7c 100644
--- a/code/modules/surgery/organs/organ_internal.dm
+++ b/code/modules/surgery/organs/organ_internal.dm
@@ -176,7 +176,7 @@
 	if(owner)
 		// The special flag is important, because otherwise mobs can die
 		// while undergoing transformation into different mobs.
-		Remove(owner, special=TRUE)
+		Remove(owner, TRUE)
 	return ..()
 
 /obj/item/organ/attack(mob/living/carbon/M, mob/user)
diff --git a/modular_citadel/code/datums/traits/neutral.dm b/modular_citadel/code/datums/traits/neutral.dm
index de682418..d26f64a1 100644
--- a/modular_citadel/code/datums/traits/neutral.dm
+++ b/modular_citadel/code/datums/traits/neutral.dm
@@ -9,14 +9,13 @@
 	lose_text = "<span class='notice'>You don't feel that burning sensation anymore.</span>"
 
 /datum/quirk/libido/add()
-	var/mob/living/M = quirk_holder
-	M.min_arousal = 16
-	M.arousal_rate = 3
+	quirk_holder.min_arousal = 16
+	quirk_holder.arousal_rate = 3
 
 /datum/quirk/libido/remove()
-	var/mob/living/M = quirk_holder
-	M.min_arousal = initial(M.min_arousal)
-	M.arousal_rate = initial(M.arousal_rate)
+	if(quirk_holder)
+		quirk_holder.min_arousal = initial(quirk_holder.min_arousal)
+		quirk_holder.arousal_rate = initial(quirk_holder.arousal_rate)
 
 /datum/quirk/libido/on_process()
 	var/mob/living/M = quirk_holder