diff --git a/app/Http/Resources/WalletTransactionResource.php b/app/Http/Resources/WalletTransactionResource.php
index cfc8ab10..2805faed 100644
--- a/app/Http/Resources/WalletTransactionResource.php
+++ b/app/Http/Resources/WalletTransactionResource.php
@@ -27,7 +27,8 @@ class WalletTransactionResource extends JsonResource
                 $description = 'Credit Voucher for '.$this->payment_reference;
                 break;
             case 1:
-                $marking = Transaction::where('payment_reference', $this->bill_no)->first()->owner->marking;
+                $bill = Transaction::where('payment_reference', $this->bill_no)->first();
+                $marking = $bill ? $bill->owner->marking : 'Unknown';
                 $description = 'Payment For booking refs.'.'<a href="'.route('booking.details', $marking).'">'.$marking.'</a>';
                 break;
             case 11: