diff --git a/components/ILIAS/Skill/Node/class.SkillDeletionManager.php b/components/ILIAS/Skill/Node/class.SkillDeletionManager.php
index d41a05493f8d..96037cd2a68b 100755
--- a/components/ILIAS/Skill/Node/class.SkillDeletionManager.php
+++ b/components/ILIAS/Skill/Node/class.SkillDeletionManager.php
@@ -95,7 +95,7 @@ public function deleteTree(int $node_id): void
 
     public function deleteNode(int $node_id, \ilSkillTree $tree = null): void
     {
-        if ($node_id != \ilTree::POS_FIRST_NODE) {
+        if ($node_id != \ilTree::POS_FIRST_NODE || $node_id !== 0) {
             if (!$tree) {
                 $tree = $this->tree_repo->getTreeForNodeId($node_id);
             }