diff --git a/classes/studentstudyplanservice.php b/classes/studentstudyplanservice.php
index dc8cce7..84725b4 100644
--- a/classes/studentstudyplanservice.php
+++ b/classes/studentstudyplanservice.php
@@ -198,6 +198,10 @@ class studentstudyplanservice extends \external_api {
      */
     public static function list_invited_studyplans($invitekey) {
         global $DB;
+        // First check if studyplan sharing is enabled.
+        if (!get_config("local_treestudyplan","enableplansharing")) {
+            return [];
+        }
 
         $invite = $DB->get_record_select(
                         "local_treestudyplan_invit",
@@ -252,7 +256,10 @@ class studentstudyplanservice extends \external_api {
      */
     public static function get_invited_studyplan($invitekey,$studyplanid) {
         global $DB;
-
+        // First check if studyplan sharing is enabled.
+        if (!get_config("local_treestudyplan","enableplansharing")) {
+            return [];
+        }
         $invite = $DB->get_record_select(
                         "local_treestudyplan_invit",
                         $DB->sql_compare_text("invitekey"). " = " . $DB->sql_compare_text(":invitekey"),
@@ -306,7 +313,10 @@ class studentstudyplanservice extends \external_api {
      */
     public static function get_invited_page($invitekey,$pageid) {
         global $DB;
-
+        // First check if studyplan sharing is enabled.
+        if (!get_config("local_treestudyplan","enableplansharing")) {
+            return [];
+        }
         $invite = $DB->get_record_select(
                         "local_treestudyplan_invit",
                         $DB->sql_compare_text("invitekey"). " = " . $DB->sql_compare_text(":invitekey"),
diff --git a/invitations.php b/invitations.php
index 7269f09..3537b6b 100644
--- a/invitations.php
+++ b/invitations.php
@@ -51,58 +51,76 @@ if (!empty($sent)) {
 
 };
 
-print $OUTPUT->header();
+if (!get_config("local_treestudyplan","enableplansharing")) {
+    $PAGE->set_title(get_string('accessdenied', 'admin'));
+    $PAGE->set_heading(get_string('accessdenied', 'admin'));
 
-print "<p>".get_string('invite_description', 'local_treestudyplan')."</p>";
+    print $OUTPUT->header();
 
-$invites = $DB->get_records('local_treestudyplan_invit', array('user_id' => $USER->id));
+    // Render page for skill level 0 (global).
 
-print "<h3>".get_string('invite_tablecaption', 'local_treestudyplan')."</h3>";
-print "<table class='m-manage_invites'>";
-print "<thead>";
-print "<th>".get_string('invite_name', 'local_treestudyplan')."</th>";
-print "<th>".get_string('invite_email', 'local_treestudyplan')."</th>";
-print "<th>".get_string('invite_date', 'local_treestudyplan')."</th>";
-print "<th>&nbsp;</th>";
-print "</thead>";
+    print "<div class='box errorbox alert alert-danger'>";
+    print get_string('accessdenied','admin');
+    print "</div>";
 
-print "<tbody>";
-if (count($invites) > 0) {
-    foreach ($invites as $invite) {
-        $testlink  = $invitedurl."?key={$invite->invitekey}";
-        print "<tr data-id='{$invite->id}'>";
-        print "<td data-field='name'>{$invite->name}</td>";
-        print "<td data-field='email'>{$invite->email}</td>";
-        print "<td data-field='date'>".userdate($invite->idate, "%x")."</td>";
-        print "<td data-field='control'>";
+    print $OUTPUT->footer();
 
-        print "<a class='m-action-view ' href='{$testlink}' title='"
-              .get_string('invite_tooltip_testlink', 'local_treestudyplan')."'><i class='fa fa-eye'></i></a>";
-
-        print "<a class='m-action-resend m-action-confirm'";
-        print " data-confirmtext='".get_string('invite_confirm_resend', 'local_treestudyplan', $invite->name)."'";
-        print " data-confirmbtn='".get_string('send', 'local_treestudyplan')."'";
-        print " href='#' data-actionhref='edit-invite.php?resend={$invite->id}' title='"
-                .get_string('invite_tooltip_resend', 'local_treestudyplan')."'";
-        print " ><i class='fa fa-envelope'></i></a>";
-
-        print "<a href='edit-invite.php?update={$invite->id}'><i class='fa fa-pencil' title='"
-                .get_string('invite_tooltip_edit', 'local_treestudyplan')."'></i></a>";
-        print "<a class='m-action-delete m-action-confirm'";
-        print " data-confirmtext='".get_string('invite_confirm_delete', 'local_treestudyplan', $invite->name)."'";
-        print " data-confirmbtn='".get_string('delete')."'";
-        print " href='#' data-actionhref='edit-invite.php?delete={$invite->id}' title='"
-                .get_string('invite_tooltip_delete', 'local_treestudyplan')."'";
-        print " ><i class='fa fa-trash'></i></a>";
-
-        print "</td>";
-    }
+    exit;
 } else {
-    print "<tr><td colspan='6'>".get_string('invite_table_empty', 'local_treestudyplan')."</td></tr>";
-}
-print "</tbody></table>";
 
-print "<a class='btn btn-info' href='/local/treestudyplan/edit-invite.php?add=true' class='btn btn-primary' id='add_invite'>";
-print "<i class='fa fa-plus'></i> ".get_string('invite_button_new', 'local_treestudyplan')."</a>";
+    print $OUTPUT->header();
 
-print $OUTPUT->footer();
+    print "<p>".get_string('invite_description', 'local_treestudyplan')."</p>";
+
+    $invites = $DB->get_records('local_treestudyplan_invit', array('user_id' => $USER->id));
+
+    print "<h3>".get_string('invite_tablecaption', 'local_treestudyplan')."</h3>";
+    print "<table class='m-manage_invites'>";
+    print "<thead>";
+    print "<th>".get_string('invite_name', 'local_treestudyplan')."</th>";
+    print "<th>".get_string('invite_email', 'local_treestudyplan')."</th>";
+    print "<th>".get_string('invite_date', 'local_treestudyplan')."</th>";
+    print "<th>&nbsp;</th>";
+    print "</thead>";
+
+    print "<tbody>";
+    if (count($invites) > 0) {
+        foreach ($invites as $invite) {
+            $testlink  = $invitedurl."?key={$invite->invitekey}";
+            print "<tr data-id='{$invite->id}'>";
+            print "<td data-field='name'>{$invite->name}</td>";
+            print "<td data-field='email'>{$invite->email}</td>";
+            print "<td data-field='date'>".userdate($invite->idate, "%x")."</td>";
+            print "<td data-field='control'>";
+
+            print "<a class='m-action-view ' href='{$testlink}' title='"
+                .get_string('invite_tooltip_testlink', 'local_treestudyplan')."'><i class='fa fa-eye'></i></a>";
+
+            print "<a class='m-action-resend m-action-confirm'";
+            print " data-confirmtext='".get_string('invite_confirm_resend', 'local_treestudyplan', $invite->name)."'";
+            print " data-confirmbtn='".get_string('send', 'local_treestudyplan')."'";
+            print " href='#' data-actionhref='edit-invite.php?resend={$invite->id}' title='"
+                    .get_string('invite_tooltip_resend', 'local_treestudyplan')."'";
+            print " ><i class='fa fa-envelope'></i></a>";
+
+            print "<a href='edit-invite.php?update={$invite->id}'><i class='fa fa-pencil' title='"
+                    .get_string('invite_tooltip_edit', 'local_treestudyplan')."'></i></a>";
+            print "<a class='m-action-delete m-action-confirm'";
+            print " data-confirmtext='".get_string('invite_confirm_delete', 'local_treestudyplan', $invite->name)."'";
+            print " data-confirmbtn='".get_string('delete')."'";
+            print " href='#' data-actionhref='edit-invite.php?delete={$invite->id}' title='"
+                    .get_string('invite_tooltip_delete', 'local_treestudyplan')."'";
+            print " ><i class='fa fa-trash'></i></a>";
+
+            print "</td>";
+        }
+    } else {
+        print "<tr><td colspan='6'>".get_string('invite_table_empty', 'local_treestudyplan')."</td></tr>";
+    }
+    print "</tbody></table>";
+
+    print "<a class='btn btn-info' href='/local/treestudyplan/edit-invite.php?add=true' class='btn btn-primary' id='add_invite'>";
+    print "<i class='fa fa-plus'></i> ".get_string('invite_button_new', 'local_treestudyplan')."</a>";
+
+    print $OUTPUT->footer();
+}
\ No newline at end of file
diff --git a/invited.php b/invited.php
index f760ea2..84cfe8a 100644
--- a/invited.php
+++ b/invited.php
@@ -47,7 +47,22 @@ $invite = $DB->get_record_select("local_treestudyplan_invit",
                                  $DB->sql_compare_text("invitekey"). " = " . $DB->sql_compare_text(":invitekey"),
                                  ['invitekey' => $invitekey]);
 
-if (empty($invite)) {
+if (!get_config("local_treestudyplan","enableplansharing")) {
+    $PAGE->set_title(get_string('accessdenied', 'admin'));
+    $PAGE->set_heading(get_string('accessdenied', 'admin'));
+
+    print $OUTPUT->header();
+
+    // Render page for skill level 0 (global).
+
+    print "<div class='box errorbox alert alert-danger'>";
+    print get_string('accessdenied','admin');
+    print "</div>";
+
+    print $OUTPUT->footer();
+
+    exit;
+} else if (empty($invite)) {
     $PAGE->set_title(get_string('invalid_invitekey_title', 'local_treestudyplan'));
     $PAGE->set_heading(get_string('invalid_invitekey_title', 'local_treestudyplan'));