diff --git a/code/game/machinery/Sleeper.dm b/code/game/machinery/Sleeper.dm
index 8785634bc55..e4db4989b0f 100644
--- a/code/game/machinery/Sleeper.dm
+++ b/code/game/machinery/Sleeper.dm
@@ -506,7 +506,7 @@
 		return
 	if(user.restrained() || user.stat || user.weakened || user.stunned || user.paralysis || user.resting) //are you cuffed, dying, lying, stunned or other
 		return
-	if(O.anchored || get_dist(user, src) > 1 || get_dist(user, O) > 1 || user.contents.Find(src)) // is the mob anchored, too far away from you, or are you too far away from the source
+	if(get_dist(user, src) > 1 || get_dist(user, O) > 1 || user.contents.Find(src)) // is the mob anchored, too far away from you, or are you too far away from the source
 		return
 	if(!ismob(O)) //humans only
 		return
diff --git a/code/game/mecha/mecha.dm b/code/game/mecha/mecha.dm
index d34d2bb0f2e..97aef5f4afb 100644
--- a/code/game/mecha/mecha.dm
+++ b/code/game/mecha/mecha.dm
@@ -1231,6 +1231,8 @@
 /////////////////////////
 
 /obj/mecha/proc/operation_allowed(mob/living/carbon/human/H)
+	if(!ishuman(H))
+		return 0
 	for(var/ID in list(H.get_active_hand(), H.wear_id, H.belt))
 		if(src.check_access(ID,src.operation_req_access))
 			return 1
diff --git a/code/game/mecha/mecha_construction_paths.dm b/code/game/mecha/mecha_construction_paths.dm
index 37e1c1ee13e..223f6d4aa24 100644
--- a/code/game/mecha/mecha_construction_paths.dm
+++ b/code/game/mecha/mecha_construction_paths.dm
@@ -91,7 +91,7 @@
 	const_holder.icon_state = "ripley0"
 	const_holder.density = 1
 	const_holder.overlays.len = 0
-	qdel(src)
+	del(src)
 	return
 
 
diff --git a/code/game/turfs/simulated.dm b/code/game/turfs/simulated.dm
index ef7c9e94f17..a20fb422aeb 100644
--- a/code/game/turfs/simulated.dm
+++ b/code/game/turfs/simulated.dm
@@ -42,8 +42,8 @@
 
 /turf/simulated/Entered(atom/A, atom/OL)
 
-	if (istype(A,/mob/living/carbon))
-		var/mob/living/carbon/M = A
+	if (istype(A,/mob/living/carbon/human))
+		var/mob/living/carbon/human/M = A
 		if(M.lying)	return
 		if(prob(80))
 			dirt++
@@ -121,7 +121,7 @@
 		switch (src.wet)
 			if(1)
 				if(istype(M, /mob/living/carbon/human)) // Added check since monkeys don't have shoes
-					if ((M.m_intent == "run") && !(istype(M:shoes, /obj/item/clothing/shoes) && M:shoes.flags&NOSLIP))
+					if ((M.m_intent == "run") && !(istype(M:shoes, /obj/item/clothing/shoes) && M.shoes.flags&NOSLIP))
 						M.stop_pulling()
 						step(M, M.dir)
 						M << "\blue You slipped on the wet floor!"
@@ -131,7 +131,7 @@
 					else
 						M.inertia_dir = 0
 						return
-				else if(!istype(M, (/mob/living/carbon/slime || /mob/living/carbon/human/slime)) || (M:species.bodyflags & FEET_NOSLIP))
+				else if(!istype(M, (/mob/living/carbon/human/slime)) || (M.species.bodyflags & FEET_NOSLIP))
 					if (M.m_intent == "run")
 						M.stop_pulling()
 						step(M, M.dir)
diff --git a/code/modules/clothing/clothing.dm b/code/modules/clothing/clothing.dm
index e4fd5782590..6574a027f3e 100644
--- a/code/modules/clothing/clothing.dm
+++ b/code/modules/clothing/clothing.dm
@@ -387,7 +387,7 @@ BLIND     // can't see anything
 		if (!(src.loc == usr))
 			return
 
-		if (!( usr.restrained() ) && !( usr.stat ))
+		if (!( usr.restrained() ) && !( usr.stat ) && ( over_object ))
 			switch(over_object.name)
 				if("r_hand")
 					usr.u_equip(src)
diff --git a/code/modules/events/wallrot.dm b/code/modules/events/wallrot.dm
index dfaedf451ec..739ca92411b 100644
--- a/code/modules/events/wallrot.dm
+++ b/code/modules/events/wallrot.dm
@@ -1,20 +1,13 @@
-/turf/simulated/wall
-
-
-datum/event/wallrot
-	severity = 1
-
 datum/event/wallrot/setup()
 	announceWhen = rand(0, 300)
 	endWhen = announceWhen + 1
-	severity = rand(5, 10)
 
 datum/event/wallrot/announce()
 	command_alert("Harmful fungi detected on station. Station structures may be contaminated.", "Biohazard Alert")
 
 datum/event/wallrot/start()
 	spawn()
-		var/turf/center = null
+		var/turf/simulated/wall/center = null
 
 		// 100 attempts
 		for(var/i=0, i<100, i++)
@@ -24,14 +17,15 @@ datum/event/wallrot/start()
 
 		if(center)
 			// Make sure at least one piece of wall rots!
-			center:rot()
+			center.rot()
 
 			// Have a chance to rot lots of other walls.
 			var/rotcount = 0
+			var/actual_severity = severity * rand(5, 10)
 			for(var/turf/simulated/wall/W in range(5, center)) if(prob(50))
-				W:rot()
+				W.rot()
 				rotcount++
 
 				// Only rot up to severity walls
-				if(rotcount >= severity)
+				if(rotcount >= actual_severity)
 					break
\ No newline at end of file
diff --git a/code/modules/mob/living/carbon/alien/special/facehugger.dm b/code/modules/mob/living/carbon/alien/special/facehugger.dm
index 04295be82da..3f912cb3ce2 100644
--- a/code/modules/mob/living/carbon/alien/special/facehugger.dm
+++ b/code/modules/mob/living/carbon/alien/special/facehugger.dm
@@ -231,6 +231,9 @@ var/const/MAX_ACTIVE_TIME = 400
 	return
 
 /proc/CanHug(var/mob/M)
+	if(!M || !ismob(M))
+		return 0
+	
 	if(M.stat == DEAD)
 		return 0
 
diff --git a/code/modules/mob/living/carbon/human/human.dm b/code/modules/mob/living/carbon/human/human.dm
index ab92ae5d573..ded2a3c949e 100644
--- a/code/modules/mob/living/carbon/human/human.dm
+++ b/code/modules/mob/living/carbon/human/human.dm
@@ -1159,11 +1159,16 @@
 
 /mob/living/carbon/human/proc/is_lung_ruptured()
 	var/datum/organ/internal/lungs/L = internal_organs_by_name["lungs"]
+	if(!L)
+		return 0
+		
 	return L.is_bruised()
 
 /mob/living/carbon/human/proc/rupture_lung()
 	var/datum/organ/internal/lungs/L = internal_organs_by_name["lungs"]
-
+	if(!L)
+		return 0
+	
 	if(!L.is_bruised())
 		src.custom_pain("You feel a stabbing pain in your chest!", 1)
 		L.damage = L.min_bruised_damage
diff --git a/code/modules/projectiles/gun.dm b/code/modules/projectiles/gun.dm
index c32f3973882..bd823f3c4ee 100644
--- a/code/modules/projectiles/gun.dm
+++ b/code/modules/projectiles/gun.dm
@@ -292,6 +292,7 @@
 				A.loc = src
 				update_icon()
 				update_gunlight(user)
+				verbs += /obj/item/weapon/gun/proc/toggle_gunlight
 	if(istype(A, /obj/item/weapon/screwdriver))
 		if(F)
 			if(user.l_hand != src && user.r_hand != src)
@@ -304,13 +305,18 @@
 				update_gunlight(user)
 				S.update_brightness(user)
 				update_icon()
+				verbs -= /obj/item/weapon/gun/proc/toggle_gunlight
 	..()
 	return
 
-/obj/item/weapon/gun/verb/toggle_gunlight()
+/obj/item/weapon/gun/proc/toggle_gunlight()
 	set name = "Toggle Gunlight"
 	set category = "Object"
 	set desc = "Click to toggle your weapon's attached flashlight."
+	
+	if(!F)
+		return
+	
 	var/mob/living/carbon/human/user = usr
 	if(!isturf(user.loc))
 		user << "You cannot turn the light on while in this [user.loc]."
diff --git a/code/modules/reagents/Chemistry-Holder.dm b/code/modules/reagents/Chemistry-Holder.dm
index e8e27bba046..436dc211d61 100644
--- a/code/modules/reagents/Chemistry-Holder.dm
+++ b/code/modules/reagents/Chemistry-Holder.dm
@@ -398,7 +398,7 @@ datum
 				return 1
 
 			check_gofast(var/mob/M)
-				if(istype(M, /mob))
+				if(M && istype(M, /mob))
 					if(M.reagents.has_reagent("hyperzine")||M.reagents.has_reagent("nuka_cola"))
 						return 1
 					else
diff --git a/code/modules/reagents/Chemistry-Reagents.dm b/code/modules/reagents/Chemistry-Reagents.dm
index e1ed81089cf..81b19610875 100644
--- a/code/modules/reagents/Chemistry-Reagents.dm
+++ b/code/modules/reagents/Chemistry-Reagents.dm
@@ -2581,15 +2581,16 @@ datum
 				return
 
 			Del()
-				if (istype(holder.my_atom,/mob/living))
-					var/mob/living/M as mob
-					var/to_remove = 0
-					if (holder.has_reagent("anti_toxin"))
-						to_remove = min(holder.get_reagent_amount("anti_toxin"),data)
-						holder.remove_reagent("anti_toxin", to_remove, 0)
-						data -= to_remove
-					if(M)
-						M.adjustToxLoss((data-1)*rand(2,4))
+				if(holder)
+					if (istype(holder.my_atom,/mob/living))
+						var/mob/living/M as mob
+						var/to_remove = 0
+						if (holder.has_reagent("anti_toxin"))
+							to_remove = min(holder.get_reagent_amount("anti_toxin"),data)
+							holder.remove_reagent("anti_toxin", to_remove, 0)
+							data -= to_remove
+						if(M)
+							M.adjustToxLoss((data-1)*rand(2,4))
 				..()
 
 		psilocybin
diff --git a/code/modules/research/protolathe.dm b/code/modules/research/protolathe.dm
index b1ddc3eb62a..2554415323f 100644
--- a/code/modules/research/protolathe.dm
+++ b/code/modules/research/protolathe.dm
@@ -199,8 +199,9 @@ Note: Must be placed west/left of and R&D console to function.
 	busy = 0
 	src.updateUsrDialog()
 
-	src.overlays += "protolathe_[stack.name]"
-	sleep(10)
-	src.overlays -= "protolathe_[stack.name]"
+	if(stack)
+		src.overlays += "protolathe_[stack.name]"
+		sleep(10)
+		src.overlays -= "protolathe_[stack.name]"
 
 	return
diff --git a/code/modules/research/xenoarchaeology/artifact/artifact.dm b/code/modules/research/xenoarchaeology/artifact/artifact.dm
index 1ba21f79667..83e5fea7781 100644
--- a/code/modules/research/xenoarchaeology/artifact/artifact.dm
+++ b/code/modules/research/xenoarchaeology/artifact/artifact.dm
@@ -66,8 +66,9 @@
 
 /obj/structure/boulder/attackby(obj/item/weapon/W as obj, mob/user as mob)
 	if (istype(W, /obj/item/device/core_sampler))
-		src.geological_data.artifact_distance = rand(-100,100) / 100
-		src.geological_data.artifact_id = artifact_find.artifact_id
+		if(geological_data)
+			src.geological_data.artifact_distance = rand(-100,100) / 100
+			src.geological_data.artifact_id = artifact_find.artifact_id
 
 		var/obj/item/device/core_sampler/C = W
 		C.sample_item(src, user)
diff --git a/code/modules/research/xenoarchaeology/finds/finds.dm b/code/modules/research/xenoarchaeology/finds/finds.dm
index a8f5a8f6cb1..e2b4215128b 100644
--- a/code/modules/research/xenoarchaeology/finds/finds.dm
+++ b/code/modules/research/xenoarchaeology/finds/finds.dm
@@ -544,12 +544,14 @@
 
 		if(talkative)
 			new_item.talking_atom = new()
-			talking_atom.holder_atom = new_item
-			talking_atom.init()
+			if(talking_atom)
+				talking_atom.holder_atom = new_item
+				talking_atom.init()
 
 		del(src)
 
 	else if(talkative)
 		src.talking_atom = new()
-		talking_atom.holder_atom = src
-		talking_atom.init()
+		if(talking_atom)
+			talking_atom.holder_atom = src
+			talking_atom.init()