diff --git a/src/Neo.VM/ExecutionEngine.cs b/src/Neo.VM/ExecutionEngine.cs
index bec60c4348..d5ae88ee2e 100644
--- a/src/Neo.VM/ExecutionEngine.cs
+++ b/src/Neo.VM/ExecutionEngine.cs
@@ -288,7 +288,7 @@ public T Pop<T>() where T : StackItem
         /// </summary>
         protected virtual void PostExecuteInstruction(Instruction instruction)
         {
-            if (ReferenceCounter.Count < Limits.MaxStackSize) return;
+            if (ReferenceCounter.Count <= Limits.MaxStackSize) return;
             if (ReferenceCounter.CheckZeroReferred() > Limits.MaxStackSize)
                 throw new InvalidOperationException($"MaxStackSize exceed: {ReferenceCounter.Count}");
         }
diff --git a/src/Neo.VM/JumpTable/JumpTable.Compound.cs b/src/Neo.VM/JumpTable/JumpTable.Compound.cs
index 817b460cf9..038bbf609c 100644
--- a/src/Neo.VM/JumpTable/JumpTable.Compound.cs
+++ b/src/Neo.VM/JumpTable/JumpTable.Compound.cs
@@ -119,6 +119,7 @@ public virtual void Unpack(ExecutionEngine engine, Instruction instruction)
                 default:
                     throw new InvalidOperationException($"Invalid type for {instruction.OpCode}: {compound.Type}");
             }
+            engine.ReferenceCounter.TryCleanTrackedItem(compound);
             engine.Push(compound.Count);
         }
 
diff --git a/src/Neo.VM/ReferenceCounter.cs b/src/Neo.VM/ReferenceCounter.cs
index f9ea08a2e2..82bf565870 100644
--- a/src/Neo.VM/ReferenceCounter.cs
+++ b/src/Neo.VM/ReferenceCounter.cs
@@ -292,5 +292,16 @@ internal void RemoveStackReference(StackItem item)
             if (--item.StackReferences == 0)
                 _zeroReferred.Add(item);
         }
+
+        internal bool TryCleanTrackedItem(StackItem item)
+        {
+            if (item.StackReferences > 0 || item.ObjectReferences?.Values.Any(p => p.References > 0 && p.Item.OnStack) == true)
+                // Still referred by stack or some compound item
+                return false;
+            if (item is CompoundType compound)
+                _referencesCount -= compound.SubItemsCount;
+            item.Cleanup();
+            return _trackedItems.Remove(item);
+        }
     }
 }