diff --git a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/util/CoreBukkitUtils.java b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/util/CoreBukkitUtils.java
index 45c811a..188a462 100644
--- a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/util/CoreBukkitUtils.java
+++ b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/util/CoreBukkitUtils.java
@@ -235,7 +235,7 @@ public final class CoreBukkitUtils {
     }
 
     @NotNull
-    public static String serializeItemStack(@Nullable ItemStack stack) {
+    public static String serializeItemStack(@NotNull ItemStack stack) {
         if (!Bukkit.getPluginManager().isPluginEnabled("ProtocolLib")) {
             throw new RuntimeException("ProtocolLib 前置插件未启用, 无法序列化物品！");
         }