diff --git a/.gitignore b/.gitignore
index c6ef218..706fd07 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,2 @@
 .idea
-
+.vscode
diff --git a/classes/plagiarism_pchkorg_api_provider.php b/classes/plagiarism_pchkorg_api_provider.php
index 9cc5149..6ce11c6 100644
--- a/classes/plagiarism_pchkorg_api_provider.php
+++ b/classes/plagiarism_pchkorg_api_provider.php
@@ -658,7 +658,7 @@ class plagiarism_pchkorg_api_provider {
         global $USER;
 
         if ($this->is_group_token()) {
-            return $this->token . '::' . hash('sha256', $this->token . $USER->email);
+            return $this->token . '::' . hash('sha256', $this->token . strtolower($USER->email));
         }
 
         return $this->token;
diff --git a/version.php b/version.php
index 6e1d7f4..c400936 100644
--- a/version.php
+++ b/version.php
@@ -26,9 +26,9 @@ defined('MOODLE_INTERNAL') || die();
 if (!isset($plugin)) {
     $plugin = new stdClass();
 }
-$plugin->version = 2023062316;
+$plugin->version = 2023070415;
 $plugin->requires = 2020061501; // Requires Moodle 3.9 .
-$plugin->release = 'v3.14.3';
+$plugin->release = 'v3.14.4';
 $plugin->component = 'plagiarism_pchkorg';
 $plugin->maturity = MATURITY_STABLE;
 $plugin->dependencies = array(