diff --git a/app/Ninja/Transformers/InvoiceTransformer.php b/app/Ninja/Transformers/InvoiceTransformer.php
index 81999a2a6481..413f43ce1a10 100644
--- a/app/Ninja/Transformers/InvoiceTransformer.php
+++ b/app/Ninja/Transformers/InvoiceTransformer.php
@@ -87,9 +87,9 @@ class InvoiceTransformer extends EntityTransformer
             'end_date' => $invoice->end_date,
             'last_sent_date' => $invoice->last_sent_date,
             'recurring_invoice_id' => (int) $invoice->recurring_invoice_id,
-            'tax_name1' => $invoice->tax_name1,
+            'tax_name1' => $invoice->tax_name1 ? $invoice->tax_name1 : '',
             'tax_rate1' => (float) $invoice->tax_rate1,
-            'tax_name2' => $invoice->tax_name2,
+            'tax_name2' => $invoice->tax_name2 ? $invoice->tax_name2 : '',
             'tax_rate2' => (float) $invoice->tax_rate2,
             'amount' => (float) $invoice->amount,
             'balance' => (float) $invoice->balance,