Fixes some runtimes (hopefully)

code/_onclick/hud/screen_objects.dm

@@ -19,7 +19,7 @@
 /obj/screen/Destroy()
 	master = null
 	return ..()
-	
+
 /obj/screen/proc/component_click(obj/screen/component_button/component, params)
 	return
 
@@ -46,9 +46,8 @@
 	object_overlays.Cut()
 
 /obj/screen/inventory/proc/add_overlays()
-	var/mob/user = hud.mymob
-
-	if(hud && user && slot_id)
+	if(hud && hud.mymob && slot_id)
+		var/mob/user = hud.mymob
 		var/obj/item/holding = user.get_active_hand()
 
 		if(!holding || user.get_equipped_item(slot_id))
@@ -619,7 +618,7 @@
 		var/mob/living/carbon/C = hud.mymob
 		if(C.handcuffed)
 			add_overlay(handcuff_overlay)
-			
+
 // PIP stuff
 /obj/screen/component_button
 	var/obj/screen/parent
@@ -634,7 +633,7 @@
 
 // Character setup stuff
 /obj/screen/setup_preview
-	
+
 	var/datum/preferences/pref
 
 /obj/screen/setup_preview/Destroy()
@@ -704,7 +703,7 @@
  * size of the screen. This is not ideal, as filter() is faster, and has
  * alpha masks, but the alpha masks it has can't be animated, so the 'ping'
  * mode of this device isn't possible using that technique.
- * 
+ *
  * The markers use that technique, though, so at least there's that.
  */
 /obj/screen/movable/mapper_holder
@@ -722,7 +721,7 @@
 	var/obj/screen/mapper/mask_full/mask_full
 	var/obj/screen/mapper/mask_ping/mask_ping
 	var/obj/screen/mapper/bg/bg
-	
+
 	var/obj/screen/mapper/frame/frame
 	var/obj/screen/mapper/powbutton/powbutton
 	var/obj/screen/mapper/mapbutton/mapbutton
@@ -732,7 +731,7 @@
 
 /obj/screen/movable/mapper_holder/Initialize(mapload, newowner)
 	owner = newowner
-	
+
 	mask_full = new(src) // Full white square mask
 	mask_ping = new(src) // Animated 'pinging' mask
 	bg = new(src) // Background color, holds map in vis_contents, uses mult against masks
@@ -740,19 +739,19 @@
 	frame = new(src) // Decorative frame
 	powbutton = new(src) // Clickable button
 	mapbutton = new(src) // Clickable button
-	
+
 	frame.icon_state = initial(frame.icon_state)+owner.hud_frame_hint
 
 	/**
 	 * The vis_contents layout is: this(frame,extras_holder,mask(bg(map)))
 	 * bg is set to BLEND_MULTIPLY against the mask to crop it.
 	 */
-	
+
 	mask_full.vis_contents.Add(bg)
 	mask_ping.vis_contents.Add(bg)
 	frame.vis_contents.Add(powbutton,mapbutton)
 	vis_contents.Add(frame)
-	
+
 
 /obj/screen/movable/mapper_holder/Destroy()
 	qdel_null(mask_full)
@@ -772,12 +771,12 @@
 		running = TRUE
 		if(ping)
 			vis_contents.Add(mask_ping)
-		else	
+		else
 			vis_contents.Add(mask_full)
 
 	bg.vis_contents.Cut()
 	bg.vis_contents.Add(map)
-	
+
 	if(extras && !extras_holder)
 		extras_holder = extras
 		vis_contents += extras_holder
@@ -790,7 +789,7 @@
 		off()
 	else
 		on()
-	
+
 /obj/screen/movable/mapper_holder/proc/mapClick()
 	if(owner)
 		if(running)
@@ -818,7 +817,7 @@
 	mouse_opacity = 0
 	var/obj/screen/movable/mapper_holder/parent
 
-/obj/screen/mapper/New()	
+/obj/screen/mapper/New()
 	..()
 	parent = loc
 
@@ -921,10 +920,10 @@
 	var/static/list/ammo_screen_loc_list = list(ui_ammo_hud1, ui_ammo_hud2, ui_ammo_hud3 ,ui_ammo_hud4)
 
 /obj/screen/ammo/proc/add_hud(var/mob/living/user, var/obj/item/weapon/gun/G)
-	
+
 	if(!user?.client)
 		return
-	
+
 	if(!G)
 		CRASH("/obj/screen/ammo/proc/add_hud() has been called from [src] without the required param of G")