[MIRROR] fix a bunch of runtimes (#10683)

Co-authored-by: Kashargul <144968721+Kashargul@users.noreply.github.com>

code/game/machinery/computer/camera.dm

@@ -119,6 +119,7 @@ GLOBAL_LIST_EMPTY(bodycamera_screens) // CHOMPEdit
 	power_change()
 
 /obj/machinery/computer/security/telescreen/entertainment/Destroy()
+	GLOB.entertainment_screens -= src
 	if(showing)
 		stop_showing()
 	vis_contents.Cut()

code/game/objects/mail.dm

@@ -195,7 +195,7 @@
 /obj/item/mail/proc/unwrap(mob/user)
 	if(recipient_ref)
 		var/datum/mind/recipient = recipient_ref.resolve()
-		if(recipient && recipient.current.dna.unique_enzymes != user.dna.unique_enzymes)
+		if(recipient && recipient.current?.dna.unique_enzymes != user.dna.unique_enzymes)
 			to_chat(user, span_danger("You can't open somebody's mail! That's <em>illegal</em>"))
 			return FALSE
 

code/modules/admin/verbs/buildmode.dm

@@ -11,6 +11,8 @@
 
 #define LAST_BUILDMODE		10
 
+GLOBAL_LIST_EMPTY(active_buildmode_holders)
+
 /proc/togglebuildmode(mob/M as mob in player_list)
 	set name = "Toggle Build Mode"
 	set category = "Special Verbs"
@@ -20,7 +22,7 @@
 			M.client.buildmode = 0
 			M.client.show_popup_menus = 1
 			M.plane_holder.set_vis(VIS_BUILDMODE, FALSE)
-			for(var/obj/effect/bmode/buildholder/H)
+			for(var/obj/effect/bmode/buildholder/H in GLOB.active_buildmode_holders)
 				if(H.cl == M.client)
 					qdel(H)
 		else
@@ -205,7 +207,12 @@
 	var/copied_faction = null
 	var/warned = 0
 
+/obj/effect/bmode/buildholder/Initialize(mapload)
+	. = ..()
+	GLOB.active_buildmode_holders += src
+
 /obj/effect/bmode/buildholder/Destroy()
+	GLOB.active_buildmode_holders -= src
 	qdel(builddir)
 	builddir = null
 	qdel(buildhelp)

code/modules/mob/new_player/new_player.dm

@@ -117,7 +117,7 @@
 
 	output += "</div>"
 
-	if (client.prefs.lastlorenews == GLOB.news_data.newsindex)
+	if (client.prefs?.lastlorenews == GLOB.news_data.newsindex)
 		client.seen_news = 1
 
 	if(GLOB.news_data.station_newspaper && !client.seen_news && client.prefs?.read_preference(/datum/preference/toggle/show_lore_news))

code/modules/reagents/reagent_containers/_reagent_containers.dm

@@ -167,6 +167,8 @@
 	return 1
 
 /obj/item/reagent_containers/proc/liquid_belly_check()
+	if(!reagents)
+		return FALSE
 	for(var/datum/reagent/R in reagents.reagent_list)
 		if(R.from_belly)
 			return TRUE

code/modules/tgui/modules/camera.dm

@@ -83,7 +83,7 @@
 	var/turf/newturf = get_turf(active_camera)
 	var/area/B = newturf?.loc // No cam tracking in dorms!
 	// Show static if can't use the camera
-	if(!active_camera?.can_use() || B.flag_check(AREA_BLOCK_TRACKING))
+	if(!active_camera?.can_use() || B?.flag_check(AREA_BLOCK_TRACKING))
 		show_camera_static()
 	if(!ui)
 		var/user_ref = REF(user)
@@ -143,9 +143,10 @@
 		var/obj/machinery/camera/C = cameras["[ckey(c_tag)]"]
 		if(active_camera)
 			UnregisterSignal(active_camera, COMSIG_OBSERVER_MOVED)
-		active_camera = C
-		active_camera.AddComponent(/datum/component/recursive_move)
-		RegisterSignal(active_camera, COMSIG_OBSERVER_MOVED, PROC_REF(update_active_camera_screen))
+		if(C)
+			active_camera = C
+			active_camera.AddComponent(/datum/component/recursive_move)
+			RegisterSignal(active_camera, COMSIG_OBSERVER_MOVED, PROC_REF(update_active_camera_screen))
 		playsound(tgui_host(), get_sfx("terminal_type"), 25, FALSE)
 		update_active_camera_screen()
 		return TRUE
@@ -179,10 +180,14 @@
 				. = TRUE
 
 /datum/tgui_module/camera/proc/update_active_camera_screen()
+	if(!active_camera)
+		show_camera_static()
+		return TRUE
+
 	var/turf/newturf = get_turf(active_camera)
 	var/area/B = newturf?.loc // No cam tracking in dorms!
 	// Show static if can't use the camera
-	if(!active_camera?.can_use() || B.flag_check(AREA_BLOCK_TRACKING))
+	if(!active_camera.can_use() || B?.flag_check(AREA_BLOCK_TRACKING))
 		show_camera_static()
 		return TRUE
 

code/modules/vore/persist/persist_vr.dm

@@ -15,7 +15,7 @@
 
 // Handle people leaving due to round ending.
 /hook/roundend/proc/persist_locations()
-	for(var/mob/Player in human_mob_list)
+	for(var/mob/living/carbon/human/Player in human_mob_list)
 		if(!Player.mind || isnewplayer(Player))
 			continue // No mind we can do nothing, new players we care not for
 		else if(Player.stat == DEAD)
@@ -27,6 +27,9 @@
 			persist_interround_data(Player, using_map.spawnpoint_died)
 		else
 			var/turf/playerTurf = get_turf(Player)
+			if(!playerTurf)
+				log_debug("Player [Player.name] ([Player.ckey]) playing as [Player.species] was in nullspace at round end.")
+				continue
 			if(isAdminLevel(playerTurf.z))
 				// Evac'd - Next round they arrive on the shuttle.
 				persist_interround_data(Player, using_map.spawnpoint_left)