Fixes a bunch of runtimes (#27363)

* hjnbujihbhuji

* uioybgyub

* Fixes a bunch of crunchy runtimes

code/modules/atmospherics/gasmixtures/gas_mixture.dm

@@ -664,6 +664,9 @@ What are the archived variables for?
 	var/total_agent_b = 0
 
 	for(var/datum/gas_mixture/G as anything in mixtures)
+		if(!istype(G))
+			stack_trace("share_many_airs had [G] in mixtures ([json_encode(mixtures)])")
+			continue
 		total_volume += G.volume
 		var/heat_capacity = G.heat_capacity()
 		total_heat_capacity += heat_capacity
@@ -685,6 +688,8 @@ What are the archived variables for?
 
 		//Update individual gas_mixtures by volume ratio
 		for(var/datum/gas_mixture/G as anything in mixtures)
+			if(!istype(G))
+				continue
 			G.private_oxygen = total_oxygen * G.volume / total_volume
 			G.private_nitrogen = total_nitrogen * G.volume / total_volume
 			G.private_toxins = total_toxins * G.volume / total_volume

code/modules/mob/living/simple_animal/hostile/hostile.dm

@@ -472,6 +472,9 @@
 		A.attack_animal(src)//Bang on it till we get out
 
 /mob/living/simple_animal/hostile/proc/FindHidden()
+	if(QDELETED(target))
+		LoseTarget()
+		return
 	if(istype(target.loc, /obj/structure/closet) || istype(target.loc, /obj/machinery/disposal) || istype(target.loc, /obj/machinery/sleeper) || istype(target.loc, /obj/machinery/bodyscanner) || istype(target.loc, /obj/machinery/recharge_station))
 		var/atom/A = target.loc
 		Goto(A,move_to_delay,minimum_distance)

code/modules/mob/mob.dm

@@ -613,6 +613,8 @@ GLOBAL_LIST_INIT(slot_equipment_priority, list( \
 	DEFAULT_QUEUE_OR_CALL_VERB(VERB_CALLBACK(src, PROC_REF(run_examinate), A))
 
 /mob/proc/run_examinate(atom/A)
+	if(QDELETED(A))
+		return
 	if(A.invisibility > see_invisible)
 		A = get_turf(A)
 	if(!has_vision(information_only = TRUE) && !isobserver(src))