diff --git a/bintree.c b/bintree.c
index 6a95f4e..b1cf8f5 100644
--- a/bintree.c
+++ b/bintree.c
@@ -59,7 +59,17 @@ void *nextTreeData(TreeNode *root)
 // Releases all memory resources (including data copies).
 void clearTree(TreeNode *root)
 {
+ if (root == NULL) return; // Basisfall: leerer Teilbaum
 
+    // Rekursiv zuerst die Kinder freigeben
+    clearTree(root->left);
+    clearTree(root->right);
+
+    // Daten freigeben
+    free(root->data);
+
+    // Knoten selbst freigeben
+    free(root);
 }
 
 // Returns the number of entries in the tree given by root.