Fixes glowshroom runtimes

code/game/objects/effects/glowshroom.dm

@@ -13,6 +13,8 @@
 	var/delay_spread = 2 MINUTES
 	/// Time interval between glowshroom decay checks
 	var/delay_decay = 30 SECONDS
+	/// Keeps track of timers for when we inevitably get deleted.
+	var/list/timers = list("spread", "decay")
 	/// Boolean to indicate if the shroom is on the floor/wall
 	var/floor = 0
 	/// Mushroom generation number
@@ -46,8 +48,8 @@
 	. += "This is a [generation]\th generation [name]!"
 
 /obj/structure/glowshroom/Destroy()
-	if(myseed)
-		QDEL_NULL(myseed)
+	deltimer(timers["spread"])
+	deltimer(timers["decay"])
 	return ..()
 
 /**
@@ -142,6 +144,8 @@
 				continue
 
 			Decay(TRUE, 2) // Decay before spawning new mushrooms to reduce their endurance
+			if(QDELETED(src))	//Decay can end us
+				return
 			var/obj/structure/glowshroom/child = new type(newLoc, myseed, TRUE, TRUE)
 			child.generation = generation + 1
 			shrooms_planted++