diff --git a/src/main/java/com/xzavier0722/mc/plugin/slimefun4/storage/controller/BlockDataController.java b/src/main/java/com/xzavier0722/mc/plugin/slimefun4/storage/controller/BlockDataController.java
index 938754d0af..db0491ac56 100644
--- a/src/main/java/com/xzavier0722/mc/plugin/slimefun4/storage/controller/BlockDataController.java
+++ b/src/main/java/com/xzavier0722/mc/plugin/slimefun4/storage/controller/BlockDataController.java
@@ -1095,11 +1095,15 @@ private void scheduleBlockInvUpdate(ScopeKey scopeKey, RecordKey reqKey, String
         if (item == null) {
             scheduleDeleteTask(scopeKey, reqKey, true);
         } else {
-            var data = new RecordSet();
-            data.put(FieldKey.LOCATION, lKey);
-            data.put(FieldKey.INVENTORY_SLOT, slot + "");
-            data.put(FieldKey.INVENTORY_ITEM, item);
-            scheduleWriteTask(scopeKey, reqKey, data, true);
+            try {
+                var data = new RecordSet();
+                data.put(FieldKey.LOCATION, lKey);
+                data.put(FieldKey.INVENTORY_SLOT, slot + "");
+                data.put(FieldKey.INVENTORY_ITEM, item);
+                scheduleWriteTask(scopeKey, reqKey, data, true);
+            } catch (IllegalArgumentException e) {
+                Slimefun.logger().log(Level.WARNING, e.getMessage());
+            }
         }
     }
 
@@ -1132,11 +1136,15 @@ private void scheduleUniversalInvUpdate(ScopeKey scopeKey, RecordKey reqKey, UUI
         if (item == null) {
             scheduleDeleteTask(scopeKey, reqKey, true);
         } else {
-            var data = new RecordSet();
-            data.put(FieldKey.UNIVERSAL_UUID, uuid.toString());
-            data.put(FieldKey.INVENTORY_SLOT, slot + "");
-            data.put(FieldKey.INVENTORY_ITEM, item);
-            scheduleWriteTask(scopeKey, reqKey, data, true);
+            try {
+                var data = new RecordSet();
+                data.put(FieldKey.UNIVERSAL_UUID, uuid.toString());
+                data.put(FieldKey.INVENTORY_SLOT, slot + "");
+                data.put(FieldKey.INVENTORY_ITEM, item);
+                scheduleWriteTask(scopeKey, reqKey, data, true);
+            } catch (IllegalArgumentException e) {
+                Slimefun.logger().log(Level.WARNING, e.getMessage());
+            }
         }
     }
 
diff --git a/src/main/java/com/xzavier0722/mc/plugin/slimefun4/storage/controller/ProfileDataController.java b/src/main/java/com/xzavier0722/mc/plugin/slimefun4/storage/controller/ProfileDataController.java
index 3ef46d09b8..a373e9661d 100644
--- a/src/main/java/com/xzavier0722/mc/plugin/slimefun4/storage/controller/ProfileDataController.java
+++ b/src/main/java/com/xzavier0722/mc/plugin/slimefun4/storage/controller/ProfileDataController.java
@@ -10,12 +10,14 @@
 import io.github.thebusybiscuit.slimefun4.api.player.PlayerBackpack;
 import io.github.thebusybiscuit.slimefun4.api.player.PlayerProfile;
 import io.github.thebusybiscuit.slimefun4.api.researches.Research;
+import io.github.thebusybiscuit.slimefun4.implementation.Slimefun;
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
 import java.util.UUID;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.logging.Level;
 import java.util.stream.Collectors;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -275,11 +277,15 @@ public void saveBackpackInventory(PlayerBackpack bp, Set<Integer> slots) {
             if (is == null) {
                 scheduleDeleteTask(new UUIDKey(DataScope.NONE, bp.getOwner().getUniqueId()), key, false);
             } else {
-                var data = new RecordSet();
-                data.put(FieldKey.BACKPACK_ID, id);
-                data.put(FieldKey.INVENTORY_SLOT, slot + "");
-                data.put(FieldKey.INVENTORY_ITEM, is);
-                scheduleWriteTask(new UUIDKey(DataScope.NONE, bp.getOwner().getUniqueId()), key, data, false);
+                try {
+                    var data = new RecordSet();
+                    data.put(FieldKey.BACKPACK_ID, id);
+                    data.put(FieldKey.INVENTORY_SLOT, slot + "");
+                    data.put(FieldKey.INVENTORY_ITEM, is);
+                    scheduleWriteTask(new UUIDKey(DataScope.NONE, bp.getOwner().getUniqueId()), key, data, false);
+                } catch (IllegalArgumentException e) {
+                    Slimefun.logger().log(Level.WARNING, e.getMessage());
+                }
             }
         });
     }
diff --git a/src/main/java/com/xzavier0722/mc/plugin/slimefun4/storage/util/DataUtils.java b/src/main/java/com/xzavier0722/mc/plugin/slimefun4/storage/util/DataUtils.java
index 38d6f04c13..fc9409a01a 100644
--- a/src/main/java/com/xzavier0722/mc/plugin/slimefun4/storage/util/DataUtils.java
+++ b/src/main/java/com/xzavier0722/mc/plugin/slimefun4/storage/util/DataUtils.java
@@ -20,6 +20,10 @@ public class DataUtils {
     public static String itemStack2String(ItemStack itemStack) {
         Debug.log(TestCase.BACKPACK, "Serializing itemstack: " + itemStack);
 
+        if (itemStack == null) {
+            return "";
+        }
+
         var stream = new ByteArrayOutputStream();
         try (var bs = new BukkitObjectOutputStream(stream)) {
             bs.writeObject(itemStack);