Fixes a bunch of runtimes (#27363)

* hjnbujihbhuji

* uioybgyub

* Fixes a bunch of crunchy runtimes

code/_onclick/hud/hud_datum.dm

@@ -227,11 +227,11 @@
 		if(HUD_STYLE_ACTIONHUD)	//No HUD
 			hud_shown = TRUE	//Governs behavior of other procs
 			if(static_inventory.len)
-				mymob.client.screen -= static_inventory
+				screenmob.client.screen -= static_inventory
 			if(toggleable_inventory.len)
-				mymob.client.screen -= toggleable_inventory
+				screenmob.client.screen -= toggleable_inventory
 			if(infodisplay.len)
-				mymob.client.screen -= infodisplay
+				screenmob.client.screen -= infodisplay
 
 	hud_version = display_hud_version
 	persistent_inventory_update(screenmob)

code/game/objects/effects/decals/Cleanable/humans.dm

@@ -71,7 +71,7 @@
 		else
 			animate_levitate(src, -1, rand(30,120))
 
-		if(weightless_image.icon_state)
+		if(weightless_image && weightless_image.icon_state)
 			icon_state = weightless_image.icon_state
 
 		overlays -= weightless_image

code/game/objects/effects/decals/cleanable.dm

@@ -87,10 +87,10 @@
 
 /obj/effect/decal/cleanable/Initialize(mapload)
 	. = ..()
+	prepare_huds()
 	if(should_merge_decal(loc))
 		return INITIALIZE_HINT_QDEL
 	var/datum/atom_hud/data/janitor/jani_hud = GLOB.huds[DATA_HUD_JANITOR]
-	prepare_huds()
 	jani_hud.add_to_hud(src)
 	jani_hud_set_sign()
 	if(random_icon_states && length(src.random_icon_states) > 0)

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))