diff --git a/core/src/mindustry/world/blocks/units/UnitFactory.java b/core/src/mindustry/world/blocks/units/UnitFactory.java
index 31572b6e05..ce1afc67f1 100644
--- a/core/src/mindustry/world/blocks/units/UnitFactory.java
+++ b/core/src/mindustry/world/blocks/units/UnitFactory.java
@@ -60,7 +60,7 @@ public class UnitFactory extends UnitBlock{
             tile.progress = 0;
         });
 
-        consume(new ConsumeItemDynamic((UnitFactoryBuild e) -> e.currentPlan != -1 ? plans.get(e.currentPlan).requirements : ItemStack.empty));
+        consume(new ConsumeItemDynamic((UnitFactoryBuild e) -> e.currentPlan != -1 ? plans.get(Math.min(e.currentPlan, plans.size - 1)).requirements : ItemStack.empty));
     }
 
     @Override