diff --git a/bintree.c b/bintree.c
index 4391f2a..c54d5a2 100644
--- a/bintree.c
+++ b/bintree.c
@@ -51,7 +51,7 @@ TreeNode *addToTree(TreeNode *root, const void *data, size_t dataSize, CompareFc
 
 TreeNode *addToTreeRec(TreeNode *currentNode, TreeNode *newNode, CompareFctType compareFct, int *isDuplicate, const int root)
 {
-    if ((currentNode == NULL))
+    /*if ((currentNode == NULL))
     {
         if ((isDuplicate == NULL) || root)
         {
@@ -62,6 +62,19 @@ TreeNode *addToTreeRec(TreeNode *currentNode, TreeNode *newNode, CompareFctType
             return currentNode;
         }
     }
+    */
+
+
+// Mögliche Ergänzung --------------------------
+if (currentNode == NULL)
+{
+    if (isDuplicate != NULL)
+        *isDuplicate = 0;
+
+    return newNode;
+}
+//--------------------------------
+
     else if ((compareFct(currentNode->data, newNode->data) < 0))
     {
         currentNode->left   = addToTreeRec(currentNode->left, newNode, compareFct, isDuplicate, 0);
diff --git a/bintree.o b/bintree.o
index 73661e7..1b42584 100644
Binary files a/bintree.o and b/bintree.o differ
diff --git a/numbers.o b/numbers.o
index 3e5750d..bd2248e 100644
Binary files a/numbers.o and b/numbers.o differ
diff --git a/stack.o b/stack.o
index 18453ed..5580458 100644
Binary files a/stack.o and b/stack.o differ