Fixes new player runtime that makes people unable to join rounds.

code/modules/antagonists/clockcult/clock_items/construct_chassis.dm

@@ -21,8 +21,9 @@
 
 /obj/item/clockwork/construct_chassis/Destroy()
 	GLOB.poi_list -= src
-	var/list/spawners = GLOB.mob_spawners[name]
-	LAZYREMOVE(spawners, src)
+	LAZYREMOVE(GLOB.mob_spawners[name], src)
+	if(!LAZYLEN(GLOB.mob_spawners[name]))
+		GLOB.mob_spawners -= name
 	. = ..()
 
 /obj/item/clockwork/construct_chassis/examine(mob/user)

code/modules/awaymissions/corpse.dm

@@ -72,9 +72,9 @@
 /obj/effect/mob_spawn/Destroy()
 	GLOB.poi_list -= src
 	var/job_name = job_description ? job_description : name
-	GLOB.mob_spawners -= job_name
+	LAZYREMOVE(GLOB.mob_spawners[job_name], src)
 	if(!LAZYLEN(GLOB.mob_spawners[job_name]))
-		LAZYREMOVE(GLOB.mob_spawners[job_name], src)
+		GLOB.mob_spawners -= job_name
 	return ..()
 
 /obj/effect/mob_spawn/proc/can_latejoin() //If it can be taken from the lobby.

code/modules/mob/dead/new_player/new_player.dm

@@ -444,6 +444,8 @@
 		if(job && IsJobUnavailable(job.title, TRUE) == JOB_AVAILABLE)
 			available_job_count++
 	for(var/spawner in GLOB.mob_spawners)
+		if(!LAZYLEN(spawner))
+			continue
 		var/obj/effect/mob_spawn/S = pick(GLOB.mob_spawners[spawner])
 		if(!istype(S) || !S.can_latejoin())
 			continue
@@ -468,6 +470,8 @@
 			"Security" = list(jobs = list(), titles = GLOB.security_positions, color = "#ff9999"),
 		)
 		for(var/spawner in GLOB.mob_spawners)
+			if(!LAZYLEN(spawner))
+				continue
 			var/obj/effect/mob_spawn/S = pick(GLOB.mob_spawners[spawner])
 			if(!istype(S) || !S.can_latejoin())
 				continue