diff --git a/code/modules/mob/living/basic/cult/constructs/harvester.dm b/code/modules/mob/living/basic/cult/constructs/harvester.dm
index 971c341a73a..d240bbc273f 100644
--- a/code/modules/mob/living/basic/cult/constructs/harvester.dm
+++ b/code/modules/mob/living/basic/cult/constructs/harvester.dm
@@ -208,6 +208,9 @@
 // Don't let them be near you!
 /mob/living/basic/construct/harvester/heretic/Life(seconds_per_tick, times_fired)
 	. = ..()
+	if(!.) //dead or deleted
+		return
+
 	if(!SPT_PROB(7, seconds_per_tick))
 		return
 
diff --git a/code/modules/mob/living/basic/heretic/rust_walker.dm b/code/modules/mob/living/basic/heretic/rust_walker.dm
index 230747efa5a..19c3c901993 100644
--- a/code/modules/mob/living/basic/heretic/rust_walker.dm
+++ b/code/modules/mob/living/basic/heretic/rust_walker.dm
@@ -39,8 +39,9 @@
 	icon_living = icon_state
 
 /mob/living/basic/heretic_summon/rust_walker/Life(seconds_per_tick = SSMOBS_DT, times_fired)
-	if(stat == DEAD)
-		return ..()
+	. = ..()
+	if(!.) //dead or deleted
+		return
 	var/turf/our_turf = get_turf(src)
 	if(HAS_TRAIT(our_turf, TRAIT_RUSTY))
 		adjustBruteLoss(-3 * seconds_per_tick)
diff --git a/code/modules/mob/living/basic/pets/dog/dog_subtypes.dm b/code/modules/mob/living/basic/pets/dog/dog_subtypes.dm
index 18b956e5ec2..73f06dacfb8 100644
--- a/code/modules/mob/living/basic/pets/dog/dog_subtypes.dm
+++ b/code/modules/mob/living/basic/pets/dog/dog_subtypes.dm
@@ -117,7 +117,9 @@
 
 /mob/living/basic/pet/dog/breaddog/Life(seconds_per_tick = SSMOBS_DT, times_fired)
 	. = ..()
-	if(stat)
+	if(!.) //dead or deleted
+		return
+	if(stat) // consciousness check
 		return
 
 	if(health < maxHealth)
diff --git a/code/modules/mob/living/basic/ruin_defender/mimic/mimic.dm b/code/modules/mob/living/basic/ruin_defender/mimic/mimic.dm
index 195834afd98..ad50561327c 100644
--- a/code/modules/mob/living/basic/ruin_defender/mimic/mimic.dm
+++ b/code/modules/mob/living/basic/ruin_defender/mimic/mimic.dm
@@ -268,6 +268,8 @@ GLOBAL_LIST_INIT(animatable_blacklist, typecacheof(list(
 
 /mob/living/basic/mimic/copy/Life(seconds_per_tick = SSMOBS_DT, times_fired)
 	. = ..()
+	if(!.) //dead or deleted
+		return
 	if(idledamage && !ckey && !ai_controller?.blackboard[BB_BASIC_MOB_CURRENT_TARGET]) //Objects eventually revert to normal if no one is around to terrorize
 		adjustBruteLoss(0.5 * seconds_per_tick)
 	for(var/mob/living/victim in contents) //a fix for animated statues from the flesh to stone spell
diff --git a/code/modules/mob/living/basic/slime/life.dm b/code/modules/mob/living/basic/slime/life.dm
index d101b48fea7..b1e24070ff6 100644
--- a/code/modules/mob/living/basic/slime/life.dm
+++ b/code/modules/mob/living/basic/slime/life.dm
@@ -1,6 +1,8 @@
 
 /mob/living/basic/slime/Life(seconds_per_tick = SSMOBS_DT, times_fired)
-	..()
+	. = ..()
+	if(!.) //dead or deleted
+		return
 
 	if(!HAS_TRAIT(src, TRAIT_STASIS)) //No hunger in stasis
 		handle_nutrition(seconds_per_tick)
diff --git a/code/modules/mob/living/basic/space_fauna/netherworld/migo.dm b/code/modules/mob/living/basic/space_fauna/netherworld/migo.dm
index 76e3dcc2d62..6bcac371480 100644
--- a/code/modules/mob/living/basic/space_fauna/netherworld/migo.dm
+++ b/code/modules/mob/living/basic/space_fauna/netherworld/migo.dm
@@ -58,7 +58,9 @@
 	make_migo_sound()
 
 /mob/living/basic/migo/Life(seconds_per_tick = SSMOBS_DT, times_fired)
-	..()
+	. = ..()
+	if(!.) //dead or deleted
+		return
 	if(stat)
 		return
 	if(SPT_PROB(5, seconds_per_tick))
diff --git a/code/modules/mob/living/basic/tree.dm b/code/modules/mob/living/basic/tree.dm
index b6f7e5ca4eb..b3700050209 100644
--- a/code/modules/mob/living/basic/tree.dm
+++ b/code/modules/mob/living/basic/tree.dm
@@ -61,7 +61,9 @@
 	AddComponent(/datum/component/aggro_emote, emote_list = string_list(list("growls")), emote_chance = 20)
 
 /mob/living/basic/tree/Life(seconds_per_tick = SSMOBS_DT, times_fired)
-	..()
+	. = ..()
+	if(!.) //dead or deleted
+		return
 	if(!isopenturf(loc))
 		return
 	var/turf/open/our_turf = src.loc
diff --git a/code/modules/mob/living/carbon/alien/life.dm b/code/modules/mob/living/carbon/alien/life.dm
index 7bd7d7aec49..537c0cd000c 100644
--- a/code/modules/mob/living/carbon/alien/life.dm
+++ b/code/modules/mob/living/carbon/alien/life.dm
@@ -1,6 +1,8 @@
 /mob/living/carbon/alien/Life(seconds_per_tick = SSMOBS_DT, times_fired)
+	. = ..()
+	if(!.) //dead or deleted
+		return
 	findQueen()
-	return..()
 
 /mob/living/carbon/alien/check_breath(datum/gas_mixture/breath)
 	if(HAS_TRAIT(src, TRAIT_GODMODE))
@@ -43,4 +45,6 @@
 
 /mob/living/carbon/alien/adult/Life(seconds_per_tick, times_fired)
 	. = ..()
+	if(QDELETED(src))
+		return
 	handle_organs(seconds_per_tick, times_fired)
diff --git a/code/modules/mob/living/silicon/robot/life.dm b/code/modules/mob/living/silicon/robot/life.dm
index 0f1cbfa65a5..6e9a1e2d30d 100644
--- a/code/modules/mob/living/silicon/robot/life.dm
+++ b/code/modules/mob/living/silicon/robot/life.dm
@@ -2,7 +2,7 @@
 	if(HAS_TRAIT(src, TRAIT_NO_TRANSFORM))
 		return
 
-	..()
+	. = ..()
 	handle_robot_hud_updates()
 	handle_robot_cell(seconds_per_tick, times_fired)
 
diff --git a/code/modules/mob/living/simple_animal/hostile/ooze.dm b/code/modules/mob/living/simple_animal/hostile/ooze.dm
index 3ad2d647e02..801c3cb2056 100644
--- a/code/modules/mob/living/simple_animal/hostile/ooze.dm
+++ b/code/modules/mob/living/simple_animal/hostile/ooze.dm
@@ -55,13 +55,16 @@
 /mob/living/simple_animal/hostile/ooze/Life(seconds_per_tick = SSMOBS_DT, times_fired)
 	. = ..()
 
+	if(!.) //dead or deleted
+		return
+
 	if(!mind && stat != DEAD)//no mind no change
 		return
 
 	var/nutrition_change = ooze_nutrition_loss
 
 	//Eat a bit of all the reagents we have. Gaining nutrition for actual nutritional ones.
-	for(var/i in reagents.reagent_list)
+	for(var/i in reagents?.reagent_list)
 		var/datum/reagent/reagent = i
 		var/consumption_amount = min(reagents.get_reagent_amount(reagent.type), ooze_metabolism_modifier * REAGENTS_METABOLISM * seconds_per_tick)
 		if(istype(reagent, /datum/reagent/consumable))