Fix setForgeCaps NPE

Author: Mgazul

src/main/java/com/mohistmc/plugins/EntityClear.java

@@ -13,6 +13,7 @@
 import org.bukkit.World;
 import org.bukkit.entity.Entity;
 import org.bukkit.entity.Item;
+import org.bukkit.entity.Monster;
 
 /**
  * @author Mgazul by MohistMC

src/main/java/org/bukkit/craftbukkit/v1_20_R1/inventory/CraftItemStack.java

@@ -343,8 +343,10 @@ public static ItemMeta getItemMeta(net.minecraft.world.item.ItemStack item) {
 
         if (item.getTag() == null) {
             ItemMeta meta = CraftItemFactory.instance().getItemMeta(getType(item));
-            ((CraftMetaItem) meta).setForgeCaps(item.getForgeCaps());
-            return meta;
+            if (meta != null) {
+                ((CraftMetaItem) meta).setForgeCaps(item.getForgeCaps());
+                return meta;
+            }
         }
         CraftMetaItem meta = switch (getType(item)) {
             case WRITTEN_BOOK -> new CraftMetaBookSigned(item.getTag());