diff --git a/app/HistoryObserver.php b/app/HistoryObserver.php
index 50e7454..6137b88 100644
--- a/app/HistoryObserver.php
+++ b/app/HistoryObserver.php
@@ -10,7 +10,7 @@ class HistoryObserver
         History::create([
             'model_id' => $model->id,
             'model_name' => $model->getTable(),
-            'before' => null,
+            'before' => [],
             'after' => $model->toArray(),
             'action' => HistoryAction::Insert,
         ]);
@@ -33,7 +33,7 @@ class HistoryObserver
             'model_id' => $model->id,
             'model_name' => $model->getTable(),
             'before' => $model->getRawOriginal(),
-            'after' => null,
+            'after' => [],
             'action' => HistoryAction::Delete,
         ]);
     }