diff --git a/code/modules/events/spider_infestation.dm b/code/modules/events/spider_infestation.dm
index a3c625e396..58c52cbec3 100644
--- a/code/modules/events/spider_infestation.dm
+++ b/code/modules/events/spider_infestation.dm
@@ -21,7 +21,9 @@
 
 /datum/round_event/spider_infestation/start()
 	var/list/vents = list()
-	for(var/obj/machinery/atmospherics/components/unary/vent_pump/temp_vent in world)
+	for(var/obj/machinery/atmospherics/components/unary/vent_pump/temp_vent in GLOB.machines)
+		if(QDELETED(temp_vent))
+			continue
 		if(is_station_level(temp_vent.loc.z) && !temp_vent.welded)
 			var/datum/pipeline/temp_vent_parent = temp_vent.parents[1]
 			if(temp_vent_parent.other_atmosmch.len > 20)