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Co-authored-by: David Siegfried <david.siegfried@uni-vechta.de>

app/controllers/resources/resource.php

@@ -215,7 +215,7 @@ class Resources_ResourceController extends AuthenticatedController
 
     protected function addEditDeleteHandler($mode = 'add')
     {
-        $this->resource = count($this->resources) > 0 ? $this->resources[0] :null;
+        $this->resource = $this->resources[0] ?? null;
         $user = User::findCurrent();
 
         $this->show_form = false;