Resolve "Forum in freien Veranstaltungen sind nicht aufrufbar"issue-5760

Closes #5699

Merge request studip/studip!4371

3 files changed, 3 insertions, 3 deletions

diff --git a/lib/models/Forum/Category.php b/lib/models/Forum/Category.php
index 73c96e1..6ee52c8 100644
--- a/lib/models/Forum/Category.php
+++ b/lib/models/Forum/Category.php
@@ -80,7 +80,7 @@ class Category extends \SimpleORMap
                     WHERE `forum_topics`.`category_id` = :category_id",
             [
                 'category_id' => $this->category_id,
-                'user_id' => User::findCurrent()->user_id
+                'user_id' => User::findCurrent()?->user_id
             ]
         );
     }
diff --git a/lib/models/Forum/Discussion.php b/lib/models/Forum/Discussion.php
index 96bd85a..de82422 100644
--- a/lib/models/Forum/Discussion.php
+++ b/lib/models/Forum/Discussion.php
@@ -242,7 +242,7 @@ class Discussion extends SimpleORMap
 
     public function getMetaData(int $last_visit = 0): array
     {
-        $user_id = \User::findCurrent()->user_id;
+        $user_id = User::findCurrent()?->user_id;
 
         if (!$last_visit) {
             $plugin_id = \PluginEngine::getPlugin(\CoreForum::class)->getPluginId();
diff --git a/lib/models/Forum/Topic.php b/lib/models/Forum/Topic.php
index a6b298f..4ea8361 100644
--- a/lib/models/Forum/Topic.php
+++ b/lib/models/Forum/Topic.php
@@ -141,7 +141,7 @@ class Topic extends SimpleORMap
                     WHERE `forum_discussions`.`topic_id` = :topic_id",
             [
                 'topic_id' => $this->topic_id,
-                'user_id' => User::findCurrent()->user_id
+                'user_id' => User::findCurrent()?->user_id
             ]
         );
     }