diff --git a/app/controllers/elearning.php b/app/controllers/elearning.php
index 97b1b9058e059aecc6238e92bcbfa43fcd52f2aa..b2a2117ebe45fc6948140b9b415027b68a4231b4 100644
--- a/app/controllers/elearning.php
+++ b/app/controllers/elearning.php
@@ -93,8 +93,8 @@ class ElearningController extends AuthenticatedController
                 $connection_status = $connected_cms[$cms]->getConnectionStatus($cms);
 
                 foreach ($connection_status as $type => $msg) {
-                    if ($msg["error"] != "") {
-                        PageLayout::postMessage(MessageBox::error(_("Es traten Probleme bei der Anbindung einzelner Lermodule auf. Bitte wenden Sie sich an Ihren Systemadministrator."), [$cms .': ' . $msg["error"]]));
+                    if (!empty($msg["error"])) {
+                        PageLayout::postError(_("Es traten Probleme bei der Anbindung einzelner Lermodule auf. Bitte wenden Sie sich an Ihren Systemadministrator."), [$cms .': ' . $msg["error"]]);
                         $GLOBALS["ELEARNING_INTERFACE_" . $cms . "_ACTIVE"] = false;
                     }
                 }
diff --git a/lib/classes/globalsearch/GlobalSearchRoomBookings.php b/lib/classes/globalsearch/GlobalSearchRoomBookings.php
index 1d5f7bc0922495f57e843d8a484cae97f0b58f56..93bc292ae7d71af558bdf98158659eb4ff93ec7a 100644
--- a/lib/classes/globalsearch/GlobalSearchRoomBookings.php
+++ b/lib/classes/globalsearch/GlobalSearchRoomBookings.php
@@ -109,12 +109,15 @@ class GlobalSearchRoomBookings extends GlobalSearchModule
         $additional .= date('d.m.Y H:i', $res['end']);
 
         return [
-            'name' => self::mark($res['user_free_name'], $search),
-            'url'  => URLHelper::getURL('resources.php', [
-                'view'        => 'view_schedule',
-                'show_object' => $res['resource_id'],
-                'start_time'  => strtotime('last monday', $res['begin'] + 24 * 60 * 60)
-            ], true),
+            'name' => self::mark($res['name'], $search),
+            'url'  => URLHelper::getURL(
+                'dispatch.php/resources/room_planning/booking_plan/' . $res['id'],
+                [
+                    'defaultDate' => date('Y-m-d', strtotime('last monday', $res['begin'] + 24 * 60 * 60)),
+                    'display_all_requests' => true,
+                ],
+                true
+            ),
             'img'        => Icon::create('room-clear')->asImagePath(),
             'additional' => self::mark($additional, $search),
             'expand'     => null
diff --git a/lib/elearning/ConnectedCMS.class.php b/lib/elearning/ConnectedCMS.class.php
index 3b21eab33369741c6d4f04750c65e68fd6f3e36e..3dd3bfba2620c14ecc931c62ec749994f895b43f 100644
--- a/lib/elearning/ConnectedCMS.class.php
+++ b/lib/elearning/ConnectedCMS.class.php
@@ -70,26 +70,25 @@ class ConnectedCMS
     public function init($cms)
     {
         global $ELEARNING_INTERFACE_MODULES;
-        $this->name = $ELEARNING_INTERFACE_MODULES[$cms]["name"] ?? null;
+
+        $this->name = $ELEARNING_INTERFACE_MODULES[$cms]['name'] ?? null;
         $this->ABSOLUTE_PATH_ELEARNINGMODULES = $ELEARNING_INTERFACE_MODULES[$cms]["ABSOLUTE_PATH_ELEARNINGMODULES"];
         $this->ABSOLUTE_PATH_SOAP = $ELEARNING_INTERFACE_MODULES[$cms]["ABSOLUTE_PATH_SOAP"];
-        if (isset($ELEARNING_INTERFACE_MODULES[$cms]["RELATIVE_PATH_DB_CLASSES"]))
-        {
+        if (isset($ELEARNING_INTERFACE_MODULES[$cms]["RELATIVE_PATH_DB_CLASSES"])) {
             $this->RELATIVE_PATH_DB_CLASSES = $ELEARNING_INTERFACE_MODULES[$cms]["RELATIVE_PATH_DB_CLASSES"];
             $this->db_classes = $ELEARNING_INTERFACE_MODULES[$cms]["db_classes"];
-        }
-        else {
+        } else {
             $this->RELATIVE_PATH_DB_CLASSES = false;
         }
-        $this->CLASS_PREFIX = $ELEARNING_INTERFACE_MODULES[$cms]["CLASS_PREFIX"];
-        $this->auth_necessary = $ELEARNING_INTERFACE_MODULES[$cms]["auth_necessary"];
-        $this->USER_AUTO_CREATE = $ELEARNING_INTERFACE_MODULES[$cms]["USER_AUTO_CREATE"];
-        $this->USER_PREFIX = $ELEARNING_INTERFACE_MODULES[$cms]["USER_PREFIX"];
-        $this->target_file = $ELEARNING_INTERFACE_MODULES[$cms]["target_file"];
-        $this->logo_file = $ELEARNING_INTERFACE_MODULES[$cms]["logo_file"];
-        $this->soap_data = $ELEARNING_INTERFACE_MODULES[$cms]["soap_data"];
-        $this->types = $ELEARNING_INTERFACE_MODULES[$cms]["types"];
-        $this->roles = $ELEARNING_INTERFACE_MODULES[$cms]["roles"];
+        $this->CLASS_PREFIX = $ELEARNING_INTERFACE_MODULES[$cms]['CLASS_PREFIX'];
+        $this->auth_necessary = $ELEARNING_INTERFACE_MODULES[$cms]['auth_necessary'];
+        $this->USER_AUTO_CREATE = $ELEARNING_INTERFACE_MODULES[$cms]['USER_AUTO_CREATE'] ?? null;
+        $this->USER_PREFIX = $ELEARNING_INTERFACE_MODULES[$cms]['USER_PREFIX'] ?? null;
+        $this->target_file = $ELEARNING_INTERFACE_MODULES[$cms]['target_file'] ?? null;
+        $this->logo_file = $ELEARNING_INTERFACE_MODULES[$cms]['logo_file'] ?? null;
+        $this->soap_data = $ELEARNING_INTERFACE_MODULES[$cms]['soap_data'] ?? null;
+        $this->types = $ELEARNING_INTERFACE_MODULES[$cms]['types'] ?? null;
+        $this->roles = $ELEARNING_INTERFACE_MODULES[$cms]['roles'] ?? null;
     }
 
     /**
@@ -100,16 +99,16 @@ class ConnectedCMS
     */
     public function initSubclasses()
     {
-        if ($this->auth_necessary)
-        {
-            require_once($this->CLASS_PREFIX . "ConnectedUser.class.php");
+        if ($this->auth_necessary) {
+            require_once $this->CLASS_PREFIX . "ConnectedUser.class.php";
             $classname = $this->CLASS_PREFIX . "ConnectedUser";
             $this->user = new $classname($this->cms_type);
-            require_once($this->CLASS_PREFIX  . "ConnectedPermissions.class.php");
+
+            require_once $this->CLASS_PREFIX  . "ConnectedPermissions.class.php";
             $classname = $this->CLASS_PREFIX  . "ConnectedPermissions";
             $this->permissions = new $classname($this->cms_type);
         }
-        require_once($this->CLASS_PREFIX . "ConnectedLink.class.php");
+        require_once $this->CLASS_PREFIX . "ConnectedLink.class.php";
         $classname = $this->CLASS_PREFIX . "ConnectedLink";
         $this->link = new $classname($this->cms_type);
     }
diff --git a/lib/elearning/ConnectedLink.class.php b/lib/elearning/ConnectedLink.class.php
index 80c61d1e027617c3b8723c63322d5ae0726aa120..6fa1de51dc15dee1d630c3edc496816ed9c8afc7 100644
--- a/lib/elearning/ConnectedLink.class.php
+++ b/lib/elearning/ConnectedLink.class.php
@@ -33,7 +33,7 @@ class ConnectedLink
         global $ELEARNING_INTERFACE_MODULES;
 
         $this->cms_type = $cms;
-        $this->cms_link = $ELEARNING_INTERFACE_MODULES[$cms]["ABSOLUTE_PATH_ELEARNINGMODULES"] . $ELEARNING_INTERFACE_MODULES[$cms]["target_file"];
+        $this->cms_link = $ELEARNING_INTERFACE_MODULES[$cms]["ABSOLUTE_PATH_ELEARNINGMODULES"] . ($ELEARNING_INTERFACE_MODULES[$cms]["target_file"] ?? null);
     }
 
     /**
diff --git a/lib/elearning/ELearningUtils.class.php b/lib/elearning/ELearningUtils.class.php
index d027e37210263936a4690a88916a5782dacf1639..33fb4a24a99205174d4d82de22bd320c4750702d 100644
--- a/lib/elearning/ELearningUtils.class.php
+++ b/lib/elearning/ELearningUtils.class.php
@@ -25,7 +25,7 @@ class ELearningUtils
     {
         global $connected_cms, $ELEARNING_INTERFACE_MODULES;
 
-        if (!is_object($connected_cms[$cms])) {
+        if (!isset($connected_cms[$cms]) || !is_object($connected_cms[$cms])) {
             require_once "lib/elearning/{$ELEARNING_INTERFACE_MODULES[$cms]['CLASS_PREFIX']}ConnectedCMS.class.php";
             $classname = "{$ELEARNING_INTERFACE_MODULES[$cms]['CLASS_PREFIX']}ConnectedCMS";
             $connected_cms[$cms] = new $classname($cms);
diff --git a/lib/elearning/clients/webservice_client.php b/lib/elearning/clients/webservice_client.php
index eea74a0f3704974d1cf5320bce24bcefd62a3781..a7f97f2cb6b3d3e44fde4ec4661552cefa4e45db 100644
--- a/lib/elearning/clients/webservice_client.php
+++ b/lib/elearning/clients/webservice_client.php
@@ -10,7 +10,7 @@ class WebserviceClient
     {
         static $instances = [];
 
-        if (!$instances[$classname . $webservice_url]) {
+        if (!isset($instances[$classname . $webservice_url])) {
             $instances[$classname . $webservice_url] = new $classname($webservice_url);
         }