diff --git a/app/Ninja/Transformers/ActivityTransformer.php b/app/Ninja/Transformers/ActivityTransformer.php
index 79bf729bf8dd..2e2fccb5380c 100644
--- a/app/Ninja/Transformers/ActivityTransformer.php
+++ b/app/Ninja/Transformers/ActivityTransformer.php
@@ -36,7 +36,7 @@ class ActivityTransformer extends EntityTransformer
             'is_system' => $activity->is_system ? (bool) $activity->is_system : null,
             'contact_id' => $activity->contact_id ? (int) $activity->contact->public_id : null,
             'task_id' => $activity->task_id ? (int) $activity->task->public_id : null,
-			'notes' => $activity->notes,
+			'notes' => $activity->notes ?: '',
 			'adjustment' => (float) $activity->adjustment,
 			'balance' => (float) $activity->balance,
         ];