diff --git a/application/models/Admins_model.php b/application/models/Admins_model.php
index 357ed6ad..5408a039 100644
--- a/application/models/Admins_model.php
+++ b/application/models/Admins_model.php
@@ -278,9 +278,9 @@ class Admins_model extends EA_Model {
     {
         $role_id = $this->get_admin_role_id();
 
-        $count = $this->db->get_where('users', ['id_roles' => $role_id, 'delete_datetime !=' => NULL])->num_rows();
+        $count = $this->db->get_where('users', ['id_roles' => $role_id, 'delete_datetime' => NULL])->num_rows();
 
-        if ($count === 1)
+        if ($count <= 1)
         {
             throw new RuntimeException('Record could not be deleted as the app requires at least one admin user.');
         }
@@ -338,11 +338,11 @@ class Admins_model extends EA_Model {
      * @param int $admin_id Admin ID.
      * @param string $field Name of the value to be returned.
      *
-     * @return string Returns the selected admin value from the database.
+     * @return mixed Returns the selected admin value from the database.
      *
      * @throws InvalidArgumentException
      */
-    public function value(int $admin_id, string $field): string
+    public function value(int $admin_id, string $field): mixed
     {
         if (empty($field))
         {
diff --git a/application/models/Appointments_model.php b/application/models/Appointments_model.php
index 329a149b..a4a8df30 100644
--- a/application/models/Appointments_model.php
+++ b/application/models/Appointments_model.php
@@ -264,11 +264,11 @@ class Appointments_model extends EA_Model {
      * @param int $appointment_id Appointment ID.
      * @param string $field Name of the value to be returned.
      *
-     * @return string Returns the selected appointment value from the database.
+     * @return mixed Returns the selected appointment value from the database.
      *
      * @throws InvalidArgumentException
      */
-    public function value(int $appointment_id, string $field): string
+    public function value(int $appointment_id, string $field): mixed
     {
         if (empty($field))
         {
diff --git a/application/models/Categories_model.php b/application/models/Categories_model.php
index 63e64435..62adcd47 100644
--- a/application/models/Categories_model.php
+++ b/application/models/Categories_model.php
@@ -185,11 +185,11 @@ class Categories_model extends EA_Model {
      * @param int $category_id Category ID.
      * @param string $field Name of the value to be returned.
      *
-     * @return string Returns the selected category value from the database.
+     * @return mixed Returns the selected category value from the database.
      *
      * @throws InvalidArgumentException
      */
-    public function value(int $category_id, string $field): string
+    public function value(int $category_id, string $field): mixed
     {
         if (empty($field))
         {
diff --git a/application/models/Consents_model.php b/application/models/Consents_model.php
index da79c7f5..eb41cd3d 100644
--- a/application/models/Consents_model.php
+++ b/application/models/Consents_model.php
@@ -167,11 +167,11 @@ class Consents_model extends EA_Model {
      * @param int $consent_id Consent ID.
      * @param string $field Name of the value to be returned.
      *
-     * @return string Returns the selected consent value from the database.
+     * @return mixed Returns the selected consent value from the database.
      *
      * @throws InvalidArgumentException
      */
-    public function value(int $consent_id, string $field): string
+    public function value(int $consent_id, string $field): mixed
     {
         if (empty($field))
         {
diff --git a/application/models/Customers_model.php b/application/models/Customers_model.php
index 8bbdb3f2..d9c9bf4d 100644
--- a/application/models/Customers_model.php
+++ b/application/models/Customers_model.php
@@ -245,11 +245,11 @@ class Customers_model extends EA_Model {
      * @param int $customer_id Customer ID.
      * @param string $field Name of the value to be returned.
      *
-     * @return string Returns the selected customer value from the database.
+     * @return mixed Returns the selected customer value from the database.
      *
      * @throws InvalidArgumentException
      */
-    public function value(int $customer_id, string $field): string
+    public function value(int $customer_id, string $field): mixed
     {
         if (empty($field))
         {
diff --git a/application/models/Providers_model.php b/application/models/Providers_model.php
index e64ececa..6b2777d3 100755
--- a/application/models/Providers_model.php
+++ b/application/models/Providers_model.php
@@ -358,11 +358,11 @@ class Providers_model extends EA_Model {
      * @param int $provider_id Provider ID.
      * @param string $field Name of the value to be returned.
      *
-     * @return string Returns the selected provider value from the database.
+     * @return mixed Returns the selected provider value from the database.
      *
      * @throws InvalidArgumentException
      */
-    public function value(int $provider_id, string $field): string
+    public function value(int $provider_id, string $field): mixed
     {
         if (empty($field))
         {
diff --git a/application/models/Roles_model.php b/application/models/Roles_model.php
index 48924284..525fc4ad 100644
--- a/application/models/Roles_model.php
+++ b/application/models/Roles_model.php
@@ -183,11 +183,11 @@ class Roles_model extends EA_Model {
      * @param int $role_id Role ID.
      * @param string $field Name of the value to be returned.
      *
-     * @return string Returns the selected role value from the database.
+     * @return mixed Returns the selected role value from the database.
      *
      * @throws InvalidArgumentException
      */
-    public function value(int $role_id, string $field): string
+    public function value(int $role_id, string $field): mixed
     {
         if (empty($field))
         {
diff --git a/application/models/Secretaries_model.php b/application/models/Secretaries_model.php
index 0f2ee758..741908d5 100644
--- a/application/models/Secretaries_model.php
+++ b/application/models/Secretaries_model.php
@@ -355,11 +355,11 @@ class Secretaries_model extends EA_Model {
      * @param int $secretary_id Secretary ID.
      * @param string $field Name of the value to be returned.
      *
-     * @return string Returns the selected secretary value from the database.
+     * @return mixed Returns the selected secretary value from the database.
      *
      * @throws InvalidArgumentException
      */
-    public function value(int $secretary_id, string $field): string
+    public function value(int $secretary_id, string $field): mixed
     {
         if (empty($field))
         {
diff --git a/application/models/Services_model.php b/application/models/Services_model.php
index 1d2b1c19..a66851ae 100644
--- a/application/models/Services_model.php
+++ b/application/models/Services_model.php
@@ -241,11 +241,11 @@ class Services_model extends EA_Model {
      * @param int $service_id Service ID.
      * @param string $field Name of the value to be returned.
      *
-     * @return string Returns the selected service value from the database.
+     * @return mixed Returns the selected service value from the database.
      *
      * @throws InvalidArgumentException
      */
-    public function value(int $service_id, string $field): string
+    public function value(int $service_id, string $field): mixed
     {
         if (empty($field))
         {
diff --git a/application/models/Settings_model.php b/application/models/Settings_model.php
index ee2cf658..bf56ea73 100644
--- a/application/models/Settings_model.php
+++ b/application/models/Settings_model.php
@@ -184,11 +184,11 @@ class Settings_model extends EA_Model {
      * @param int $setting_id Setting ID.
      * @param string $field Name of the value to be returned.
      *
-     * @return string Returns the selected setting value from the database.
+     * @return mixed Returns the selected setting value from the database.
      *
      * @throws InvalidArgumentException
      */
-    public function value(int $setting_id, string $field): string
+    public function value(int $setting_id, string $field): mixed
     {
         if (empty($field))
         {
diff --git a/application/models/Unavailabilities_model.php b/application/models/Unavailabilities_model.php
index a560c4d9..5bbf6bea 100644
--- a/application/models/Unavailabilities_model.php
+++ b/application/models/Unavailabilities_model.php
@@ -218,11 +218,11 @@ class Unavailabilities_model extends EA_Model {
      * @param int $unavailability_id Unavailability ID.
      * @param string $field Name of the value to be returned.
      *
-     * @return string Returns the selected unavailability value from the database.
+     * @return mixed Returns the selected unavailability value from the database.
      *
      * @throws InvalidArgumentException
      */
-    public function value(int $unavailability_id, string $field): string
+    public function value(int $unavailability_id, string $field): mixed
     {
         if (empty($field))
         {
diff --git a/application/models/Users_model.php b/application/models/Users_model.php
index 33fe525a..7e3db0af 100644
--- a/application/models/Users_model.php
+++ b/application/models/Users_model.php
@@ -234,11 +234,11 @@ class Users_model extends EA_Model {
      * @param int $user_id User ID.
      * @param string $field Name of the value to be returned.
      *
-     * @return string Returns the selected user value from the database.
+     * @return mixed Returns the selected user value from the database.
      *
      * @throws InvalidArgumentException
      */
-    public function value(int $user_id, string $field): string
+    public function value(int $user_id, string $field): mixed
     {
         if (empty($field))
         {
diff --git a/application/models/Webhooks_model.php b/application/models/Webhooks_model.php
index d360b57a..57dd9cb1 100644
--- a/application/models/Webhooks_model.php
+++ b/application/models/Webhooks_model.php
@@ -182,11 +182,11 @@ class Webhooks_model extends EA_Model {
      * @param int $webhook_id Webhook ID.
      * @param string $field Name of the value to be returned.
      *
-     * @return string Returns the selected webhook value from the database.
+     * @return mixed Returns the selected webhook value from the database.
      *
      * @throws InvalidArgumentException
      */
-    public function value(int $webhook_id, string $field): string
+    public function value(int $webhook_id, string $field): mixed
     {
         if (empty($field))
         {