likely the cause of the missing notifications

transformstudios/zakat-v3#130

src/Notifications/AlertRaised.php

@@ -14,7 +14,7 @@ public function toArray(): array
         return array_merge(
             parent::toArray(),
             [
-                'locations' => implode(',', Arr::get($this->alert, 'locations')),
+                'locations' => implode(',', Arr::get($this->alert, 'locations', [])),
             ]
         );
     }