Logs some data and continues the loop

code/modules/events/spider_terror.dm

@@ -15,6 +15,10 @@
 	var/list/vents = list()
 	for(var/obj/machinery/atmospherics/unary/vent_pump/temp_vent in GLOB.all_vent_pumps)
 		if(is_station_level(temp_vent.loc.z) && !temp_vent.welded)
+			if(!temp_vent.parent)
+				// Issue happening more often with vents. Log and continue. Delete once solved
+				log_debug("spider_terror/start(), vent has no parent: [temp_vent], qdeled: [QDELETED(temp_vent)], loc: [temp_vent.loc]")
+				continue
 			if(temp_vent.parent.other_atmosmch.len > 50)
 				vents += temp_vent
 	var/spider_type