Forgot annotation here

src/main/java/io/github/thebusybiscuit/slimefun4/implementation/items/electric/machines/entities/ExpCollector.java

@@ -50,6 +50,7 @@ public class ExpCollector extends SlimefunItem implements InventoryBlock, Energy
     private int energyConsumedPerTick = -1;
     private int energyCapacity = -1;
 
+    @ParametersAreNonnullByDefault
     public ExpCollector(ItemGroup itemGroup, SlimefunItemStack item, RecipeType recipeType, ItemStack[] recipe) {
         this(itemGroup, item, recipeType, recipe, 4.0);
     }