Few issues, solved.

code/modules/shuttle/shuttle_creation/shuttle_creator_console.dm

@@ -58,7 +58,7 @@
 	. = ..()
 	owner_rsd.overlay_holder.remove_client()
 	eyeobj.invisibility = INVISIBILITY_MAXIMUM
-	if(user.client)
+	if(user?.client)
 		user.client.images -= eyeobj.user_image
 
 /obj/machinery/computer/camera_advanced/shuttle_creator/attack_hand(mob/user)

code/modules/shuttle/shuttle_creation/shuttle_creator_overlay.dm

@@ -12,8 +12,9 @@
 	holder.images += images
 
 /datum/shuttle_creator_overlay_holder/proc/remove_client()
-	holder.images -= images
-	holder = null
+	if(holder)
+		holder.images -= images
+		holder = null
 
 /datum/shuttle_creator_overlay_holder/proc/clear_highlights()
 	if(holder)