fix audit logs

DataTables/AuditLogsDataTable.php

@@ -29,10 +29,10 @@
                     }
 
                     if (isset($model->subject->name)) {
-                        return $model->subject->name;
+                        return $model->subject->name ?? $model->subject->user()->first()->name;
                     }
 
-                    return $model->subject->user()->first()->name;
+                    return "-";//$model->subject->user()->first()->name;
                 })
                 ->editColumn('causer_id', function (Activity $model) {
                     return $model->causer ? $model->causer->name : __('System');