diff --git a/README.md b/README.md
index ea97708..b72f5e5 100644
--- a/README.md
+++ b/README.md
@@ -16,9 +16,9 @@ Restrict access to any activity by ip-address. This plugin can be used to make a
 ![Moodle38](https://img.shields.io/badge/moodle-3.8-brightgreen.svg)
 ![Moodle39](https://img.shields.io/badge/moodle-3.9-brightgreen.svg)
 ![Moodle310](https://img.shields.io/badge/moodle-3.10-brightgreen.svg)
+![Moodle40](https://img.shields.io/badge/moodle-4.00-brightgreen.svg)
 ![PHP7.2](https://img.shields.io/badge/PHP-7.2-brightgreen.svg)
-
-![Screenshot](https://moodle.org/pluginfile.php/50/local_plugins/plugin_screenshots/2292/2019-05-15_11-01-39.png)
+![PHP7.3](https://img.shields.io/badge/PHP-7.3-brightgreen.svg)
 
 ## List of features
 - Supports comma separate list of ip-addresses
@@ -60,3 +60,5 @@ Contributions are welcome and will be fully credited. We accept contributions vi
 ## Changelog
 
 - 2022021100 Thanks for adding ip-range support @[juacas](https://github.com/juacas)
+- 2022052800 Fixed the [issue 6](https://github.com/MFreakNL/moodle-availability_ipaddress/issues/6) @[hamzatamyachte](https://github.com/hamzatamyachte)
+- 2022052801 Test in Moodle 4.0 @[hamzatamyachte](https://github.com/hamzatamyachte)
diff --git a/classes/condition.php b/classes/condition.php
index a6814e0..3161f3a 100644
--- a/classes/condition.php
+++ b/classes/condition.php
@@ -82,15 +82,15 @@ class condition extends \core_availability\condition {
     public function is_available($not, info $info, $grabthelot, $userid) : bool {
 
         if (empty($this->ipaddresses)) {
-            return true;
+            return !$not;
         }
 
         // Check if ip-address matches.
         if (address_in_subnet(getremoteaddr(), trim($this->ipaddresses))) {
-            return true;
+            return !$not;
         }
 
-        return false;
+        return $not;
     }
 
     /**
diff --git a/version.php b/version.php
index ca0fd5c..5dcab06 100644
--- a/version.php
+++ b/version.php
@@ -27,7 +27,7 @@
 defined('MOODLE_INTERNAL') || die();
 
 $plugin->component = 'availability_ipaddress';
-$plugin->version = 2022021100;
+$plugin->version = 2022052801;
 $plugin->release = '3.11.0';
 $plugin->requires = 2016120500;
 $plugin->maturity = MATURITY_STABLE;