diff --git a/src/main/java/io/github/thebusybiscuit/slimefun4/api/exceptions/WrongItemStackException.java b/src/main/java/io/github/thebusybiscuit/slimefun4/api/exceptions/WrongItemStackException.java
deleted file mode 100644
index ef1c9e6c46..0000000000
--- a/src/main/java/io/github/thebusybiscuit/slimefun4/api/exceptions/WrongItemStackException.java
+++ /dev/null
@@ -1,39 +0,0 @@
-package io.github.thebusybiscuit.slimefun4.api.exceptions;
-
-import javax.annotation.ParametersAreNonnullByDefault;
-
-import org.bukkit.inventory.ItemStack;
-
-import io.github.thebusybiscuit.slimefun4.api.items.SlimefunItem;
-import io.github.thebusybiscuit.slimefun4.api.items.SlimefunItemStack;
-import io.github.thebusybiscuit.slimefun4.core.attributes.DamageableItem;
-
-/**
- * A {@link WrongItemStackException} is thrown when someone tries to alter an {@link ItemStack}
- * but actually wanted to alter a different one.
- * 
- * If for example a {@link DamageableItem} accidentally damages the original {@link SlimefunItem}
- * instead of the held {@link ItemStack}, this will be thrown.
- * 
- * @author TheBusyBiscuit
- * 
- * @see SlimefunItemStack
- * @see SlimefunItem
- *
- */
-public class WrongItemStackException extends RuntimeException {
-
-    private static final long serialVersionUID = 9144658137363309071L;
-
-    /**
-     * This constructs a new {@link WrongItemStackException} with the given error context.
-     * 
-     * @param message
-     *            An error message to display
-     */
-    @ParametersAreNonnullByDefault
-    public WrongItemStackException(String message) {
-        super("You probably wanted to alter a different ItemStack: " + message);
-    }
-
-}
diff --git a/src/main/java/io/github/thebusybiscuit/slimefun4/api/items/SlimefunItem.java b/src/main/java/io/github/thebusybiscuit/slimefun4/api/items/SlimefunItem.java
index c9ce57cbe1..3d52b81245 100644
--- a/src/main/java/io/github/thebusybiscuit/slimefun4/api/items/SlimefunItem.java
+++ b/src/main/java/io/github/thebusybiscuit/slimefun4/api/items/SlimefunItem.java
@@ -31,7 +31,6 @@
 import io.github.thebusybiscuit.slimefun4.api.exceptions.IncompatibleItemHandlerException;
 import io.github.thebusybiscuit.slimefun4.api.exceptions.MissingDependencyException;
 import io.github.thebusybiscuit.slimefun4.api.exceptions.UnregisteredItemException;
-import io.github.thebusybiscuit.slimefun4.api.exceptions.WrongItemStackException;
 import io.github.thebusybiscuit.slimefun4.api.player.PlayerProfile;
 import io.github.thebusybiscuit.slimefun4.api.recipes.RecipeType;
 import io.github.thebusybiscuit.slimefun4.api.researches.Research;
@@ -575,20 +574,6 @@ private void loadItemHandlers() {
         }
     }
 
-    /**
-     * This method returns whether the original {@link SlimefunItemStack} of this
-     * {@link SlimefunItem} is immutable.
-     * 
-     * If <code>true</code> is returned, then any changes to the original {@link SlimefunItemStack}
-     * will be rejected with a {@link WrongItemStackException}.
-     * This ensures integrity so developers don't accidentally damage the wrong {@link ItemStack}.
-     * 
-     * @return Whether the original {@link SlimefunItemStack} is immutable.
-     */
-    protected boolean isItemStackImmutable() {
-        return true;
-    }
-
     /**
      * This method checks if the dependencies have been set up correctly.
      * 
diff --git a/src/main/java/io/github/thebusybiscuit/slimefun4/api/items/SlimefunItemStack.java b/src/main/java/io/github/thebusybiscuit/slimefun4/api/items/SlimefunItemStack.java
index 025067dcca..bfe2d2312b 100644
--- a/src/main/java/io/github/thebusybiscuit/slimefun4/api/items/SlimefunItemStack.java
+++ b/src/main/java/io/github/thebusybiscuit/slimefun4/api/items/SlimefunItemStack.java
@@ -42,7 +42,6 @@
 import io.github.bakedlibs.dough.skins.PlayerSkin;
 import io.github.thebusybiscuit.slimefun4.api.MinecraftVersion;
 import io.github.thebusybiscuit.slimefun4.api.exceptions.PrematureCodeException;
-import io.github.thebusybiscuit.slimefun4.api.exceptions.WrongItemStackException;
 import io.github.thebusybiscuit.slimefun4.implementation.Slimefun;
 import io.github.thebusybiscuit.slimefun4.utils.HeadTexture;
 import io.github.thebusybiscuit.slimefun4.utils.compatibility.VersionedItemFlag;