Runtime fixes.

code/modules/modular_computers/computers/item/computer.dm

@@ -307,7 +307,7 @@
 	update_icon()
 
 
-/obj/item/device/modular_computer/attackby(obj/item/weapon/W as obj, mob/user as mob)
+/obj/item/device/modular_computer/attackby(obj/item/weapon/W, mob/user)
 	// Insert items into the components
 	for(var/h in all_components)
 		var/obj/item/weapon/computer_hardware/H = all_components[h]

code/modules/modular_computers/computers/item/computer_components.dm

@@ -3,11 +3,13 @@
 		return FALSE
 
 	if(H.w_class > max_hardware_size)
-		to_chat(user, "<span class='warning'>This component is too large for \the [src]!</span>")
+		if(user)
+			to_chat(user, "<span class='warning'>This component is too large for \the [src]!</span>")
 		return FALSE
 
 	if(all_components[H.device_type])
-		to_chat(user, "<span class='warning'>This computer's hardware slot is already occupied by \the [all_components[H.device_type]].</span>")
+		if(user)
+			to_chat(user, "<span class='warning'>This computer's hardware slot is already occupied by \the [all_components[H.device_type]].</span>")
 		return FALSE
 	return TRUE
 
@@ -23,7 +25,8 @@
 
 	all_components[H.device_type] = H
 
-	to_chat(user, "<span class='notice'>You install \the [H] into \the [src].</span>")
+	if(user)
+		to_chat(user, "<span class='notice'>You install \the [H] into \the [src].</span>")
 	H.holder = src
 	H.on_install(src, user)
 
@@ -35,7 +38,8 @@
 
 	all_components.Remove(H.device_type)
 
-	to_chat(user, "<span class='notice'>You remove \the [H] from \the [src].</span>")
+	if(user)
+		to_chat(user, "<span class='notice'>You remove \the [H] from \the [src].</span>")
 
 	H.forceMove(get_turf(src))
 	H.holder = null