diff --git a/paper-api/src/main/java/org/bukkit/inventory/ItemStack.java b/paper-api/src/main/java/org/bukkit/inventory/ItemStack.java
index bab86d8049..a37ac7caeb 100644
--- a/paper-api/src/main/java/org/bukkit/inventory/ItemStack.java
+++ b/paper-api/src/main/java/org/bukkit/inventory/ItemStack.java
@@ -68,6 +68,7 @@ public class ItemStack implements Cloneable, ConfigurationSerializable {
     @Deprecated
     public ItemStack(@NotNull final Material type, final int amount, final short damage, @Nullable final Byte data) {
         Validate.notNull(type, "Material cannot be null");
+        Validate.isTrue(type.isItem(), "Material must be an item: ", type);
         this.type = type;
         this.amount = amount;
         if (damage != 0) {
@@ -116,6 +117,7 @@ public class ItemStack implements Cloneable, ConfigurationSerializable {
     @Utility
     public void setType(@NotNull Material type) {
         Validate.notNull(type, "Material cannot be null");
+        Validate.isTrue(type.isItem(), "Material must be an item: ", type);
         this.type = type;
         if (this.meta != null) {
             this.meta = Bukkit.getItemFactory().asMetaFor(meta, type);