diff --git a/application/Invoice/InvoiceModel.php b/application/Invoice/InvoiceModel.php
index 90c5d03d4..659842282 100644
--- a/application/Invoice/InvoiceModel.php
+++ b/application/Invoice/InvoiceModel.php
@@ -371,7 +371,7 @@ class InvoiceModel {
             if($invoice_file === true) {
                 $where .= " AND InvoiceFile.id > 0'";
             } elseif($invoice_file === false || $invoice_file === null) {
-                $where .= " AND InvoiceFile.id IS NOT NULL";
+                $where .= " AND InvoiceFile.id IS NULL";
             }
         }