how does that happen ??

code/game/turfs/open/water.dm

@@ -110,7 +110,7 @@
 	immerse_overlay_alpha = 190
 	fishing_datum = /datum/fish_source/hot_spring
 	/// Holder for the steam particles
-	var/obj/effect/abstract/particle_holder/cached/steam_effect
+	var/obj/effect/abstract/particle_holder/cached/particle_effect
 
 /turf/open/water/hot_spring/Initialize(mapload)
 	. = ..()
@@ -121,18 +121,18 @@
 	AddElement(/datum/element/immerse, icon, icon_state, "immerse", immerse_overlay_color, alpha = immerse_overlay_alpha)
 	immerse_added = TRUE
 	icon_state = "pool_[rand(1, 4)]"
-	steam_effect = new(src, /particles/hotspring_steam, 4)
+	particle_effect = new(src, /particles/hotspring_steam, 4)
 	//render the steam over mobs and objects on the game plane
-	steam_effect.vis_flags &= ~VIS_INHERIT_PLANE
+	particle_effect.vis_flags &= ~VIS_INHERIT_PLANE
 	//And be unaffected by ambient occlusions, which would render the steam grey
-	steam_effect.plane = MUTATE_PLANE(MASSIVE_OBJ_PLANE, src)
+	particle_effect.plane = MUTATE_PLANE(MASSIVE_OBJ_PLANE, src)
 	add_filter("hot_spring_waves", 1, wave_filter(y = 1, size = 1, offset = 0, flags = WAVE_BOUNDED))
 	var/filter = get_filter("hot_spring_waves")
 	animate(filter, offset = 1, time = 3 SECONDS, loop = -1, easing = SINE_EASING|EASE_IN|EASE_OUT)
 	animate(offset = 0, time = 3 SECONDS, easing = SINE_EASING|EASE_IN|EASE_OUT)
 
 /turf/open/water/hot_spring/Destroy()
-	QDEL_NULL(steam_effect)
+	QDEL_NULL(particle_effect)
 	remove_filter("hot_spring_waves")
 	for(var/atom/movable/movable as anything in contents)
 		exit_hot_spring(movable)