diff --git a/client_contact_add_modal.php b/client_contact_add_modal.php
index 75a52141..314fcada 100644
--- a/client_contact_add_modal.php
+++ b/client_contact_add_modal.php
@@ -8,12 +8,6 @@
                 </button>
             </div>
             <form action="post.php" method="post" enctype="multipart/form-data" autocomplete="off">
-                <!-- Prevent undefined checkbox errors on submit -->
-                <input type="hidden" name="contact_primary" value="0">
-                <input type="hidden" name="contact_important" value="0">
-                <input type="hidden" name="contact_billing" value="0">
-                <input type="hidden" name="contact_technical" value="0">
-                <!-- End prevent undefined errors -->
                 <input type="hidden" name="client_id" value="<?php echo $client_id; ?>">
                 <div class="modal-body bg-white">
 
diff --git a/post/user/contact_model.php b/post/user/contact_model.php
index 395854d7..6e0b2eae 100644
--- a/post/user/contact_model.php
+++ b/post/user/contact_model.php
@@ -9,10 +9,10 @@ $extension = preg_replace("/[^0-9]/", '', $_POST['extension']);
 $mobile = preg_replace("/[^0-9]/", '', $_POST['mobile']);
 $email = sanitizeInput($_POST['email']);
 $notes = sanitizeInput($_POST['notes']);
-$contact_primary = intval($_POST['contact_primary']);
-$contact_important = intval($_POST['contact_important']);
-$contact_billing = intval($_POST['contact_billing']);
-$contact_technical = intval($_POST['contact_technical']);
+$contact_primary = intval($_POST['contact_primary'] ?? 0);
+$contact_important = intval($_POST['contact_important'] ?? 0);
+$contact_billing = intval($_POST['contact_billing'] ?? 0);
+$contact_technical = intval($_POST['contact_technical'] ?? 0);
 $location_id = intval($_POST['location']);
 $pin = sanitizeInput($_POST['pin']);
 $auth_method = sanitizeInput($_POST['auth_method']);