diff --git a/code/__HELPERS/game.dm b/code/__HELPERS/game.dm
index 51e89cbfc37b..e41ead876a45 100644
--- a/code/__HELPERS/game.dm
+++ b/code/__HELPERS/game.dm
@@ -215,6 +215,9 @@
 
 /proc/get_hearers_in_view(R, atom/source)
 	// Returns a list of hearers in view(R) from source (ignoring luminosity). Used in saycode.
+	if(!isnum(R))
+		stack_trace("invalid get_hearers_in_view call on [source] with an range [R]")
+		return list()
 	var/turf/T = get_turf(source)
 	. = list()
 	if(!T)
diff --git a/code/__HELPERS/icon_smoothing.dm b/code/__HELPERS/icon_smoothing.dm
index 17e9adf93f1f..9965861b39b0 100644
--- a/code/__HELPERS/icon_smoothing.dm
+++ b/code/__HELPERS/icon_smoothing.dm
@@ -318,7 +318,10 @@ DEFINE_BITFIELD(smoothing_junction, list(
 	var/new_junction = NONE
 
 	for(var/direction in GLOB.cardinals) //Cardinal case first.
-		SET_ADJ_IN_DIR(src, new_junction, direction, direction)
+		try
+			SET_ADJ_IN_DIR(src, new_junction, direction, direction)
+		catch(var/exception/except)
+			CRASH("[src] tried smoothing but failed; [except]")
 
 	if(!(new_junction & (NORTH|SOUTH)) || !(new_junction & (EAST|WEST)))
 		set_smoothed_icon_state(new_junction)
diff --git a/code/_onclick/hud/alien.dm b/code/_onclick/hud/alien.dm
index d0db2a3c0d94..623497e71ca7 100644
--- a/code/_onclick/hud/alien.dm
+++ b/code/_onclick/hud/alien.dm
@@ -122,6 +122,8 @@
 	if(!mymob)
 		return
 	var/mob/living/carbon/alien/humanoid/H = mymob
+	if(!H.client)
+		return
 	if(hud_version != HUD_STYLE_NOHUD)
 		for(var/obj/item/I in H.held_items)
 			I.screen_loc = ui_hand_position(H.get_held_index_of_item(I))
diff --git a/code/_onclick/hud/generic_dextrous.dm b/code/_onclick/hud/generic_dextrous.dm
index beeacbbccb4a..8ca1e6f1128a 100644
--- a/code/_onclick/hud/generic_dextrous.dm
+++ b/code/_onclick/hud/generic_dextrous.dm
@@ -67,6 +67,8 @@
 	if(!mymob)
 		return
 	var/mob/living/D = mymob
+	if(!D.client)
+		return
 	if(hud_version != HUD_STYLE_NOHUD)
 		for(var/obj/item/I in D.held_items)
 			I.screen_loc = ui_hand_position(D.get_held_index_of_item(I))
diff --git a/code/_onclick/hud/guardian.dm b/code/_onclick/hud/guardian.dm
index 1c5bcd4362c5..6a548eba9c89 100644
--- a/code/_onclick/hud/guardian.dm
+++ b/code/_onclick/hud/guardian.dm
@@ -100,7 +100,7 @@
 	static_inventory += using
 
 /datum/hud/dextrous/guardian/persistent_inventory_update()
-	if(!mymob)
+	if(!mymob || !mymob.client)
 		return
 	if(istype(mymob, /mob/living/simple_animal/hostile/guardian/dextrous))
 		var/mob/living/simple_animal/hostile/guardian/dextrous/D = mymob
diff --git a/code/_onclick/hud/hud.dm b/code/_onclick/hud/hud.dm
index 0d00724a4329..9fdf71a69c8e 100644
--- a/code/_onclick/hud/hud.dm
+++ b/code/_onclick/hud/hud.dm
@@ -240,6 +240,8 @@ GLOBAL_LIST_INIT(available_ui_styles, list(
 	return TRUE
 
 /datum/hud/proc/plane_masters_update()
+	if(!mymob.client)
+		return
 	// Plane masters are always shown to OUR mob, never to observers
 	for(var/thing in plane_masters)
 		var/atom/movable/screen/plane_master/PM = plane_masters[thing]
diff --git a/code/datums/components/_component.dm b/code/datums/components/_component.dm
index b7dc8c2a3c05..d4d7989a58c3 100644
--- a/code/datums/components/_component.dm
+++ b/code/datums/components/_component.dm
@@ -216,6 +216,9 @@
  * * sig_typeor_types Signal string key or list of signal keys to stop listening to specifically
  */
 /datum/proc/UnregisterSignal(datum/target, sig_type_or_types)
+	if(!target)
+		stack_trace("Unregister Signal called without a target by [src].")
+		return
 	var/list/lookup = target.comp_lookup
 	if(!signal_procs || !signal_procs[target] || !lookup)
 		return
diff --git a/code/datums/quirks/negative.dm b/code/datums/quirks/negative.dm
index bda4756d3292..872c9ade4407 100644
--- a/code/datums/quirks/negative.dm
+++ b/code/datums/quirks/negative.dm
@@ -443,6 +443,8 @@
 	RegisterSignal(quirk_holder, COMSIG_MOB_EXAMINATE, PROC_REF(looks_at_floor))
 
 /datum/quirk/social_anxiety/remove()
+	if(!quirk_holder)
+		return
 	UnregisterSignal(quirk_holder, list(COMSIG_MOB_EYECONTACT, COMSIG_MOB_EXAMINATE))
 
 /datum/quirk/social_anxiety/on_process(delta_time)
diff --git a/code/game/atoms_movable.dm b/code/game/atoms_movable.dm
index e88693546fff..ed593fcbbe5a 100644
--- a/code/game/atoms_movable.dm
+++ b/code/game/atoms_movable.dm
@@ -376,15 +376,20 @@
 	var/area/newarea = get_area(newloc)
 	loc = newloc
 	. = TRUE
-	oldloc.Exited(src, newloc)
-	if(oldarea != newarea)
-		oldarea.Exited(src, newloc)
+	if(!oldloc)
+		stack_trace("[src] moved out of nullspace/null loc")
+	else
+		oldloc.Exited(src, newloc)
 
-	for(var/i in oldloc)
-		if(i == src) // Multi tile objects
-			continue
-		var/atom/movable/thing = i
-		thing.Uncrossed(src)
+		for(var/i in oldloc)
+			if(i == src) // Multi tile objects
+				continue
+			var/atom/movable/thing = i
+			thing.Uncrossed(src)
+
+	if(oldarea)
+		if(oldarea != newarea)
+			oldarea.Exited(src, newloc)
 
 	newloc.Entered(src, oldloc)
 	if(oldarea != newarea)
@@ -560,7 +565,7 @@
 	if(destination)
 		. = doMove(destination)
 	else
-		CRASH("No valid destination passed into forceMove")
+		CRASH("No valid destination passed into forceMove on [src]")
 
 /atom/movable/proc/moveToNullspace()
 	return doMove(null)
diff --git a/code/game/objects/items/ego_weapons/waw.dm b/code/game/objects/items/ego_weapons/waw.dm
index 772a8988a4d6..a4afcfe6f4c3 100644
--- a/code/game/objects/items/ego_weapons/waw.dm
+++ b/code/game/objects/items/ego_weapons/waw.dm
@@ -1913,7 +1913,7 @@
 		speed_slowdown = 1
 		throwforce = 100//TIME TO DIE!
 		to_chat(user,span_warning("You put your strength behind this attack."))
-		power_timer = addtimer(CALLBACK(src, PROC_REF(PowerReset)), 3 SECONDS,user, TIMER_STOPPABLE)//prevents storing 3 powered up anchors and unloading all of them at once
+		power_timer = addtimer(CALLBACK(src, PROC_REF(PowerReset)), 3 SECONDS, TIMER_STOPPABLE)//prevents storing 3 powered up anchors and unloading all of them at once
 
 /obj/item/ego_weapon/blind_obsession/proc/PowerReset(mob/user)
 	to_chat(user, span_warning("You lose your balance while holding [src]."))
diff --git a/code/game/turfs/change_turf.dm b/code/game/turfs/change_turf.dm
index 0251eb361734..04da68c9cc82 100644
--- a/code/game/turfs/change_turf.dm
+++ b/code/game/turfs/change_turf.dm
@@ -320,8 +320,7 @@ GLOBAL_LIST_INIT(blacklisted_automated_baseturfs, typecacheof(list(
 	var/energy = 0
 	var/heat_cap = 0
 
-	for(var/t in turf_list)
-		var/turf/open/T = t
+	for(var/turf/open/T in turf_list)
 		//Cache?
 		var/datum/gas_mixture/turf/mix = T.air
 		//"borrowing" this code from merge(), I need to play with the temp portion. Lets expand it out
@@ -339,8 +338,7 @@ GLOBAL_LIST_INIT(blacklisted_automated_baseturfs, typecacheof(list(
 	for(var/id in total_gases)
 		total_gases[id][MOLES] /= turflen
 
-	for(var/t in turf_list)
-		var/turf/open/T = t
+	for(var/turf/open/T in turf_list)
 		T.air.copy_from(total)
 		T.update_visuals()
 		SSair.add_to_active(T)
diff --git a/code/modules/atmospherics/environmental/LINDA_turf_tile.dm b/code/modules/atmospherics/environmental/LINDA_turf_tile.dm
index c54765eb867a..2d668a9a3348 100644
--- a/code/modules/atmospherics/environmental/LINDA_turf_tile.dm
+++ b/code/modules/atmospherics/environmental/LINDA_turf_tile.dm
@@ -134,7 +134,10 @@
 	temperature_archived = temperature
 
 /turf/open/archive()
-	air.archive()
+	if(!air)
+		stack_trace("[src] tried to archive null air at [x]x-[y]y-[z]z")
+	else
+		air.archive()
 	archived_cycle = SSair.times_fired
 	temperature_archived = temperature
 
@@ -257,8 +260,7 @@
 	max_share = 0 //Gotta reset our tracker
 	#endif
 
-	for(var/t in adjacent_turfs)
-		var/turf/open/enemy_tile = t
+	for(var/turf/open/enemy_tile in adjacent_turfs)
 
 		if(fire_count <= enemy_tile.current_cycle)
 			continue
@@ -472,8 +474,7 @@
 	var/energy = 0
 	var/heat_cap = 0
 
-	for(var/t in turf_list)
-		var/turf/open/T = t
+	for(var/turf/open/T in turf_list)
 		//Cache?
 		var/datum/gas_mixture/turf/mix = T.air
 		if (roundstart && istype(T.air, /datum/gas_mixture/immutable))
@@ -498,8 +499,7 @@
 			A_gases[id][MOLES] /= turflen
 		A.garbage_collect()
 
-	for(var/t in turf_list)
-		var/turf/open/T = t
+	for(var/turf/open/T in turf_list)
 		if(T.planetary_atmos) //We do this as a hack to try and minimize unneeded excited group spread over planetary turfs
 			T.air.copy_from(SSair.planetary[T.initial_gas_mix]) //Comes with a cost of "slower" drains, but it's worth it
 		else
diff --git a/code/modules/mob/living/simple_animal/abnormality/waw/judgement_bird.dm b/code/modules/mob/living/simple_animal/abnormality/waw/judgement_bird.dm
index 08572681433d..670c81be5251 100644
--- a/code/modules/mob/living/simple_animal/abnormality/waw/judgement_bird.dm
+++ b/code/modules/mob/living/simple_animal/abnormality/waw/judgement_bird.dm
@@ -191,7 +191,8 @@
 		if(get_dist(src, J) < 6) // Unnecessary for this distance
 			continue
 		target_turfs += get_turf(J)
-
+	if(!LAZYLEN(target_turfs))
+		return ..()
 	var/turf/target_turf = pick(target_turfs)
 	if(istype(target_turf))
 		patrol_path = get_path_to(src, target_turf, TYPE_PROC_REF(/turf, Distance_cardinal), 0, 200)
diff --git a/code/modules/projectiles/projectile.dm b/code/modules/projectiles/projectile.dm
index 25afd86cabd8..1816284fb354 100644
--- a/code/modules/projectiles/projectile.dm
+++ b/code/modules/projectiles/projectile.dm
@@ -486,8 +486,11 @@
 //Returns true if the target atom is on our current turf and above the right layer
 //If direct target is true it's the originally clicked target.
 /obj/projectile/proc/can_hit_target(atom/target, direct_target = FALSE, ignore_loc = FALSE, cross_failed = FALSE)
-	if(QDELETED(target) || impacted[target])
+	if(QDELETED(target))
 		return FALSE
+	if(target in impacted)
+		if(impacted[target])
+			return FALSE
 	if(!ignore_loc && (loc != target.loc))
 		return FALSE
 	// if pass_flags match, pass through entirely - unless direct target is set.
diff --git a/code/modules/shuttle/arrivals.dm b/code/modules/shuttle/arrivals.dm
index 3579ede1d189..89f5becfb772 100644
--- a/code/modules/shuttle/arrivals.dm
+++ b/code/modules/shuttle/arrivals.dm
@@ -107,6 +107,9 @@
 /obj/docking_port/mobile/arrivals/proc/CheckTurfsPressure()
 	for(var/I in SSjob.latejoin_trackers)
 		var/turf/open/T = get_turf(I)
+		if(!istype(T))
+			stack_trace("Closed Turf in SSjob.latejoin_trackers was checked for air pressure.")
+			continue
 		var/pressure = T.air.return_pressure()
 		if(pressure < HAZARD_LOW_PRESSURE || pressure > HAZARD_HIGH_PRESSURE)	//simple safety check
 			return TRUE