diff --git a/src/items/Recipe.java b/src/items/Recipe.java
index 52f675b..eea1af6 100644
--- a/src/items/Recipe.java
+++ b/src/items/Recipe.java
@@ -9,6 +9,7 @@ import org.jgrapht.graph.DefaultWeightedEdge;
 
 import java.util.HashMap;
 import java.util.Map;
+import java.util.stream.Collectors;
 
 public class Recipe {
     private Map<Item, Integer> inputs;
@@ -110,14 +111,25 @@ public class Recipe {
     public Graph<Item, DefaultWeightedEdge> buildGraph(Item target) {
         Graph<Item, DefaultWeightedEdge> graph = new DefaultDirectedWeightedGraph<>(DefaultWeightedEdge.class);
         graph.addVertex(target);
-        target.sum +=1;
+        target.sum += 1;
+        Map<Item, Integer> output = outputs.entrySet().stream()
+                .filter(itemIntegerEntry -> itemIntegerEntry.getKey() != target)
+                .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
+        output.forEach((item, integer) -> {
+            graph.addVertex(item);
+            graph.addEdge(target, item);
+            graph.setEdgeWeight(target, item, integer);
+        });
         inputs.forEach((item, integer) -> {
             graph.addVertex(item);
             graph.addEdge(item, target);
             graph.setEdgeWeight(item, target, integer);
 
-            Graph<Item, DefaultWeightedEdge> g = item.getRecipe().buildGraph(item);
-            Graphs.addGraph(graph, g);
+            Recipe recipe = item.getRecipe();
+            if (recipe != null) {
+                Graph<Item, DefaultWeightedEdge> g = recipe.buildGraph(item);
+                Graphs.addGraph(graph, g);
+            }
         });