diff --git a/app/Services/Invoice/AddGatewayFee.php b/app/Services/Invoice/AddGatewayFee.php
index d5699234be05..882e03fe3fab 100644
--- a/app/Services/Invoice/AddGatewayFee.php
+++ b/app/Services/Invoice/AddGatewayFee.php
@@ -24,7 +24,7 @@ class AddGatewayFee extends AbstractService
 {
     private $company_gateway;
 
-    private $invoice;
+    public $invoice;
 
     private $amount;
 
@@ -61,7 +61,7 @@ class AddGatewayFee extends AbstractService
 
     private function cleanPendingGatewayFees()
     {
-        $invoice_items = $this->invoice->line_items;
+        $invoice_items = (array)$this->invoice->line_items;
 
         $invoice_items = collect($invoice_items)->filter(function ($item) {
             return $item->type_id != '3';
@@ -92,7 +92,7 @@ class AddGatewayFee extends AbstractService
             $invoice_item->tax_rate3 = $fees_and_limits->fee_tax_rate3;
         }
 
-        $invoice_items = $this->invoice->line_items;
+        $invoice_items = (array)$this->invoice->line_items;
         $invoice_items[] = $invoice_item;
 
         $this->invoice->line_items = $invoice_items;
@@ -122,7 +122,7 @@ class AddGatewayFee extends AbstractService
             $invoice_item->tax_rate3 = $fees_and_limits->fee_tax_rate3;
         }
 
-        $invoice_items = $this->invoice->line_items;
+        $invoice_items = (array)$this->invoice->line_items;
         $invoice_items[] = $invoice_item;
 
         $this->invoice->line_items = $invoice_items;
diff --git a/app/Utils/HtmlEngine.php b/app/Utils/HtmlEngine.php
index 9887357474b1..44a4310b696f 100644
--- a/app/Utils/HtmlEngine.php
+++ b/app/Utils/HtmlEngine.php
@@ -403,7 +403,7 @@ class HtmlEngine
         $data['$product.tax_name2'] = ['value' => '', 'label' => ctrans('texts.tax')];
         $data['$product.tax_name3'] = ['value' => '', 'label' => ctrans('texts.tax')];
         $data['$product.line_total'] = ['value' => '', 'label' => ctrans('texts.line_total')];
-        $data['$product.gross_line_total'] = ['value' => '', 'label' => ctrans('texts.line_total')];
+        $data['$product.gross_line_total'] = ['value' => '', 'label' => ctrans('texts.gross_line_total')];
         $data['$product.description'] = ['value' => '', 'label' => ctrans('texts.description')];
         $data['$product.unit_cost'] = ['value' => '', 'label' => ctrans('texts.unit_cost')];
         $data['$product.product1'] = ['value' => '', 'label' => $this->helpers->makeCustomField($this->company->custom_fields, 'product1')];
@@ -423,7 +423,7 @@ class HtmlEngine
         $data['$task.tax_name2'] = ['value' => '', 'label' => ctrans('texts.tax')];
         $data['$task.tax_name3'] = ['value' => '', 'label' => ctrans('texts.tax')];
         $data['$task.line_total'] = ['value' => '', 'label' => ctrans('texts.line_total')];
-        $data['$task.gross_line_total'] = ['value' => '', 'label' => ctrans('texts.line_total')];
+        $data['$task.gross_line_total'] = ['value' => '', 'label' => ctrans('texts.gross_line_total')];
         $data['$task.service'] = ['value' => '', 'label' => ctrans('texts.service')];
         $data['$task.task1'] = ['value' => '', 'label' => $this->helpers->makeCustomField($this->company->custom_fields, 'task1')];
         $data['$task.task2'] = ['value' => '', 'label' => $this->helpers->makeCustomField($this->company->custom_fields, 'task2')];
diff --git a/resources/lang/en/texts.php b/resources/lang/en/texts.php
index 9ec92685c9ba..0215893567bc 100644
--- a/resources/lang/en/texts.php
+++ b/resources/lang/en/texts.php
@@ -4352,6 +4352,7 @@ $LANG = array(
     'payment_type_Bancontact' => 'Bancontact',
     'payment_type_BECS' => 'BECS',
     'payment_type_ACSS' => 'ACSS',
+    'gross_line_total' => 'Gross line total',
 );
 
 return $LANG;