diff --git a/systems.cpp b/systems.cpp
index 62c70f7..4c7420b 100644
--- a/systems.cpp
+++ b/systems.cpp
@@ -624,6 +624,7 @@ bool System::use_item(const string& slot_name) {
   auto& player_combat = world.get<Combat>(level.player);
 
   if(player_combat.hp >= player_combat.max_hp) return false;
+  if(!inventory.has(slot_name)) return false;
 
   auto what = inventory.get(slot_name);