diff --git a/pkg/core/interop/runtime/util.go b/pkg/core/interop/runtime/util.go
index 522940381..aef0f8ce8 100644
--- a/pkg/core/interop/runtime/util.go
+++ b/pkg/core/interop/runtime/util.go
@@ -47,7 +47,7 @@ func GetNotifications(ic *interop.Context, v *vm.VM) error {
 		ev := stackitem.NewArray([]stackitem.Item{
 			stackitem.NewByteArray(notifications[i].ScriptHash.BytesBE()),
 			stackitem.Make(notifications[i].Name),
-			notifications[i].Item,
+			stackitem.DeepCopy(notifications[i].Item).(*stackitem.Array),
 		})
 		arr.Append(ev)
 	}
diff --git a/pkg/core/interop_system.go b/pkg/core/interop_system.go
index 508d02bfb..242460ca0 100644
--- a/pkg/core/interop_system.go
+++ b/pkg/core/interop_system.go
@@ -282,7 +282,7 @@ func runtimeNotify(ic *interop.Context, v *vm.VM) error {
 	ne := state.NotificationEvent{
 		ScriptHash: v.GetCurrentScriptHash(),
 		Name:       name,
-		Item:       stackitem.NewArray(args),
+		Item:       stackitem.DeepCopy(stackitem.NewArray(args)).(*stackitem.Array),
 	}
 	ic.Notifications = append(ic.Notifications, ne)
 	return nil