For qdel and Destroy Fixes

code/game/objects/effects/anomalies.dm

@@ -19,8 +19,10 @@
 	var/new_frequency = sanitize_frequency(rand(PUBLIC_LOW_FREQ, PUBLIC_HIGH_FREQ))
 	aSignal.set_frequency(new_frequency)
 	poi_list |= src
-	
+
 /obj/effect/anomaly/Destroy()
+	if(aSignal)
+		QDEL_NULL(aSignal)
 	poi_list.Remove(src)
 	return ..()
 

code/game/objects/effects/spiders.dm

@@ -6,6 +6,11 @@
 	anchored = 1
 	density = 0
 	var/health = 15
+	var/master_commander = null
+
+/obj/structure/spider/Destroy()
+	master_commander = null
+	return ..()
 
 //similar to weeds, but only barfed out by nurses manually
 /obj/structure/spider/ex_act(severity)
@@ -78,7 +83,6 @@
 	var/amount_grown = 0
 	var/player_spiders = 0
 	var/faction = list()
-	var/master_commander = null
 
 /obj/structure/spider/eggcluster/New()
 	pixel_x = rand(3,-3)
@@ -110,7 +114,6 @@
 	var/travelling_in_vent = 0
 	var/player_spiders = 0
 	var/faction = list()
-	var/master_commander = null
 	var/selecting_player = 0
 
 /obj/structure/spider/spiderling/New()
@@ -118,6 +121,10 @@
 	pixel_y = rand(6,-6)
 	processing_objects.Add(src)
 
+/obj/structure/spider/spiderling/Destroy()
+	entry_vent = null
+	return ..()
+
 /obj/structure/spider/spiderling/Bump(atom/user)
 	if(istype(user, /obj/structure/table))
 		src.loc = user.loc

code/game/objects/items/devices/radio/radio.dm

@@ -271,7 +271,7 @@ var/global/list/default_medbay_channels = list(
 /mob/living/automatedannouncer/Destroy()
 	if(lifetime_timer)
 		deltimer(lifetime_timer)
-	..()
+	return ..()
 
 /mob/living/automatedannouncer/proc/autocleanup()
 	log_runtime(EXCEPTION("An announcer somehow managed to outlive the radio! Deleting!"), src, list("Message: '[message]'"))

code/game/objects/items/weapons/dna_injector.dm

@@ -5,7 +5,7 @@
 	icon_state = "dnainjector"
 	item_state = "dnainjector"
 	var/block = 0
-	var/datum/dna2/record/buf=null
+	var/datum/dna2/record/buf = null
 	throw_speed = 3
 	throw_range = 5
 	w_class = 1
@@ -26,6 +26,11 @@
 		buf.dna.ResetSE()
 		SetValue(value)
 
+/obj/item/weapon/dnainjector/Destroy()
+	if(buf)
+		QDEL_NULL(buf)
+	return ..()
+
 /obj/item/weapon/dnainjector/proc/GetRealBlock(var/selblock)
 	if(selblock==0)
 		return block